mercury in glass thermometer.pdf

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Mercury-in-glass thermometer 1

Mercury-in-glass thermometer

Closeup of a maximum thermometer. The break

in the column of mercury is visible.

The mercury-in-glass or mercury thermometer was invented by

German physicist Daniel Gabriel Fahrenheit in 1714. It consists of a

bulb containing mercury attached to a glass tube of narrow diameter;

the volume of mercury in the tube is much less than the volume in the

bulb. The volume of mercury changes slightly with temperature; the

small change in volume drives the narrow mercury column a relatively

long way up the tube. The space above the mercury may be filled with

nitrogen or it may be at less than atmospheric pressure, a partial

vacuum.

In order to calibrate the thermometer, the bulb is made to reach thermal equilibrium with a temperature standard such

as an ice/water mixture, and then with another standard such as water/vapour, and the tube is divided into regular

intervals between the fixed points. In principle thermometers made of different material (e.g., coloured alcohol)

might be expected to give different intermediate readings due to different expansion properties; in practice thesubstances used are chosen to have reasonably linear expansion characteristics as a function of true thermodynamic

temperature and so give similar results.

History

Christin's "Thermometer of Lyon" (1743).

The thermometer was used by the originators of the

Fahrenheit and Celsius scales.

Anders Celsius, a Swedish scientist, devised the Celsius

scale, which was described in his publication the origin of

the Celsius temperature scale in 1742.

Celsius used two fixed points in his scale: the temperature

of melting ice and the temperature of boiling water. This

wasn't a new idea, since Isaac Newton was already

working on something similar. The distinction of Celsius

was to use the condition of melting and not that of

freezing. The experiments for reaching a good calibration

of his thermometer lasted for 2 winters. By performing the

same experiment over and over again, he discovered that

ice always melted at the same calibration mark on the

thermometer. He found a similar fixed point in the

calibration of boiling water to water vapour (when this is

done to high precision, a variation will be seen with

atmospheric pressure; Celsius noted this). At the moment

that he removed the thermometer from the vapour, the

mercury level climbed slightly. This was related to the

rapid cooling (and contraction) of the glass.

When Celsius decided to use his own temperature scale, he originally defined his scale "upside-down", i.e. he chose

to
http://en.wikipedia.org/w/index.php?title=Water_vaporhttp://en.wikipedia.org/w/index.php?title=Isaac_Newtonhttp://en.wikipedia.org/w/index.php?title=Anders_Celsiushttp://en.wikipedia.org/w/index.php?title=Celsiushttp://en.wikipedia.org/w/index.php?title=Fahrenheithttp://en.wikipedia.org/w/index.php?title=File%3ATerm%C3%B3metro_de_Lyon.jpghttp://en.wikipedia.org/w/index.php?title=Thermodynamic_temperaturehttp://en.wikipedia.org/w/index.php?title=Thermodynamic_temperaturehttp://en.wikipedia.org/w/index.php?title=Thermal_equilibriumhttp://en.wikipedia.org/w/index.php?title=Vacuumhttp://en.wikipedia.org/w/index.php?title=Atmospheric_pressurehttp://en.wikipedia.org/w/index.php?title=Nitrogenhttp://en.wikipedia.org/w/index.php?title=Glasshttp://en.wikipedia.org/w/index.php?title=Mercury_%28element%29http://en.wikipedia.org/w/index.php?title=Daniel_Gabriel_Fahrenheithttp://en.wikipedia.org/w/index.php?title=File%3AMaximum_thermometer_close_up_2.JPG


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A large mercury in glass thermometer.

set the boiling point of pure water at 0 C (212 F) and the freezing point at

100 C (32 F).[1] One year later Frenchman Jean-Pierre Christin proposed to

invert the scale with the freezing point at 0 C (32 F) and the boiling point at

100 C (212 F).[2] He named it Centigrade (100 grades).

Finally, Celsius proposed a method of calibrating a thermometer:

1.1. Place the cylinder of the thermometer in melting ice made of pure water

and mark the point where the fluid in the thermometer stabilises. This

point is the freeze/thaw point of water.

2.2. In the same manner mark the point where the fluid stabilises when the

thermometer is placed in boiling water vapour.

3.3. Divide the length between the two marks into 100 equal parts.

These points are adequate for approximate calibration but both vary with

atmospheric pressure. Nowadays, the triple point of water is used instead of

the freezing point (the triple point occurs at 273.16 kelvins (K), 0.01 C).

Before the discovery of the true thermodynamic temperature, the thermometer defined the temperature;

thermometers made with different materials would define different temperature scales (a coloured alcohol

thermometer would give a slightly different reading than a mercury thermometer at, say half-scale). In practice

several materials gave very similar temperatures to each other and, when discovered, to the thermodynamic

temperature.

Maximum thermometer

A medical mercury-in-glass maximum thermometer

showing the temperature of 38.7 C.

A special kind of mercury-in-glass thermometer, called a

maximum thermometer, works by having a constriction in the

neck close to the bulb. As the temperature rises the mercury is

pushed up through the constriction by the force of expansion.

When the temperature falls the column of mercury breaks at the

constriction and cannot return to the bulb thus remaining

stationary in the tube. The observer can then read the maximum

temperature over the set period of time. To reset the thermometer

it must be swung sharply. This design is used in the traditional

type of medical thermometer.
http://en.wikipedia.org/w/index.php?title=Medical_thermometerhttp://en.wikipedia.org/w/index.php?title=File%3AClinical_thermometer_38.7.JPGhttp://en.wikipedia.org/w/index.php?title=Triple_pointhttp://en.wikipedia.org/w/index.php?title=Centigradehttp://en.wikipedia.org/w/index.php?title=Jean-Pierre_Christinhttp://en.wikipedia.org/w/index.php?title=File%3AQuicksilvertermometer_Osaby.JPG


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Maximum minimum thermometer

A maximum minimum thermometer, also known as Six's thermometer, is a thermometer which registers the

maximum and minimum temperatures reached over a period of time, typically 24 hours. The original design contains

mercury, but solely as a way to indicate the position of a column of alcohol whose expansion indicates the

temperature; it is not a thermometer operated by the expansion of mercury; mercury-free versions are available.

Physical properties

Mercury cannot be used below the temperature at which it becomes solid, -38.83 C (-37.89 F). If the thermometer

contains nitrogen, the gas may flow down into the column when the mercury solidifies and be trapped there when the

temperature rises, making the thermometer unusable until returned to the factory for reconditioning. To avoid this,

some weather services require that all mercury-in-glass thermometers be brought indoors when the temperature falls

to -37 C (-34.6 F). To measure lower meteorological temperatures, a thermometer containing a mercury-thallium

alloy which does not solidify until the temperature drops to -61.1 C (-78 F) may be used.

Phase outAs of 2012 many mercury-in-glass thermometers are used in meteorology; however, they were becoming

increasingly rare for other uses, as many countries banned them for medical use due to the toxicity of mercury. Some

manufacturers use galinstan, a liquid alloy of gallium, indium, and tin, as a replacement for mercury.

Map of the countries of the European Union that banned mercury-in-glass thermometers

according to Directive 2007/51/EC as of 28 July 2012. Countries in blue have made legal

bans on the issue, countries in gray are of unknown status at the present, and countries in

red declared that said "Member State does not consider national execution measures

necessary."[3]

The typical "fever thermometer"

contains between 0.5 to 3 g (.3 to 1.7

dr) of elemental mercury.[4][5]

Swallowing this amount of mercury

would, it is said, pose little danger but

the inhaling of the vapour could lead to

health problems.[6]

List of countries with

regulations or

recommendations on mercury

thermometers

Argentina

In February 2009 the Argentine Health

Ministry instructed by resolution

139/09 that all health centres and

hospitals should buy mercury-free

thermometers and blood pressure

meters and called on dentists, medical

technicians, and environmental health

specialists to start eliminating this

toxin.[7] As of 2011 mercury

thermometers were still on sale to the

public at pharmacies.

AustraliaAustria
http://en.wikipedia.org/w/index.php?title=Pharmacyhttp://en.wikipedia.org/w/index.php?title=Environmental_healthhttp://en.wikipedia.org/w/index.php?title=Medical_technicianhttp://en.wikipedia.org/w/index.php?title=Medical_technicianhttp://en.wikipedia.org/w/index.php?title=Dentisthttp://en.wikipedia.org/w/index.php?title=Blood_pressure_meterhttp://en.wikipedia.org/w/index.php?title=Blood_pressure_meterhttp://en.wikipedia.org/w/index.php?title=Argentine_Health_Ministryhttp://en.wikipedia.org/w/index.php?title=Argentine_Health_Ministryhttp://en.wikipedia.org/w/index.php?title=Avoirdupoishttp://en.wikipedia.org/w/index.php?title=Gramhttp://en.wikipedia.org/w/index.php?title=File%3AEU_mercury_thermometer_ban_-_28_July_2012.pnghttp://en.wikipedia.org/w/index.php?title=European_Unionhttp://en.wikipedia.org/w/index.php?title=Tinhttp://en.wikipedia.org/w/index.php?title=Indiumhttp://en.wikipedia.org/w/index.php?title=Galliumhttp://en.wikipedia.org/w/index.php?title=Galinstanhttp://en.wikipedia.org/w/index.php?title=Medicalhttp://en.wikipedia.org/w/index.php?title=Meteorologyhttp://en.wikipedia.org/w/index.php?title=Alloyhttp://en.wikipedia.org/w/index.php?title=Thalliumhttp://en.wikipedia.org/w/index.php?title=Degree_Fahrenheithttp://en.wikipedia.org/w/index.php?title=Degree_Celsiushttp://en.wikipedia.org/w/index.php?title=Melting_pointhttp://en.wikipedia.org/w/index.php?title=Maximum_minimum_thermometer


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There was a voluntary take back action for thermometers containing mercury based on the Federal Waste

Management Plan 2006 and carried out in close cooperation between the Austrian Chamber of Pharmacists

(sterreichische Apothekerkammer), the Federal Ministry of Environment, a private waste disposer, a producer of

electronic thermometers and a pharmaceutical distributor. The disposal company supplied each pharmacy

(approximately 1,200) with a collection bin and covered the cost of disposal. The pharmaceutical distributor covered

the logistical costs for the distribution of the thermometers. The pharmacies accepted a refund of only 0.50 Euro per

thermometer for handling (which is far below their normal margin). The supplier provided the thermometers at a

reduced price. The Federal Ministry supported each sold thermometer (covering about 30% of the direct costs) and

advertised the project. During the collection period consumers could bring in a mercury thermometer and buy an

electronic thermometer for a subsidised price of 1 Euro. Between October 2007 and January 2008 about 465,000

electronic thermometers were sold and about one million mercury thermometers (containing about 1 tonne mercury)

were collected.[8]

Philippines

By the Philippines Department of Healths Administrative Order 2008-0221, all mercury equipment from hospitals,

including mercury-in-glass thermometers, will be phased out in the Philippines by September 28, 2010. Even before

the order was released, 50 hospitals have already banned mercury from their establishments. Among these fiftyhospitals, the Philippine Heart Center was the first one to do so. San Juan de Dios Hospital, Philippine Children s

Medical Center, San Lazaro Hospital, Ospital ng Muntinlupa, Lung Center of the Philippines, the National Kidney

and Transplant Institute, Manila Adventist Medical Center and Las Pias Hospital also made steps to ban the toxic

chemical. The country was the first one to make a step to ban mercury from its health care system in Southeast

Asia.[9][10]

United Kingdom

Since European Union directive 2007/51/EC came into force on 3 April 2009 the UK Health Protection Agency

(HPA) reported that mercury thermometers could no longer be sold to the general public. Shops holding stocks of

unsold thermometers had to withdraw them from sale; mercury thermometers purchased before this date could be

used without legal implications. The purpose of these restrictions is to protect the environment and public health by

decreasing the amount of mercury waste released.[11] The HPA had in 2007 released a guide to dealing with small

spills of mercury.[12]

United States of America

In the United States both the American Academy of Pediatrics[13] and the United States Environmental Protection

Agency[14] recommend that alternative thermometers be used in the home.[13]

References

[1] "Anders Celsius 17011744" (http://www.astro.uu. se/history/Celsius_eng.html).Astronomical Observatory: History. Uppsala

University. .

[2] Smith, Jacqueline (2009). "Appendix I: Chronology" (http://books. google. com/books?id=lAfa1orgvwQC& pg=PA246). The Facts on File

Dictionary of Weather and Climate. Infobase Publishing. pp. 246. ISBN 978-1-4381-0951-0. . "1743 Jean-Pierre Christin inverts the fixed

points on Celsius' scale, to produce the scale used today."

[3] "National Provisions communicated by the Member States concerning: Directive 2007/51/EC of the European Parliament and of the Council

of 25 September 2007 amending Council Directive 76/769/EEC relating to restrictions on the marketing of certain measuring devices

containing mercury" (http://eur-lex. europa. eu/LexUriServ/LexUriServ.do?uri=CELEX:72007L0051:EN:NOT#FIELD_CZ). EUR-Lex.

72007L0051. .

[4] "Thermometers and Thermostats: Fever Thermometers" (http://www.ec.gc.ca/mercure-mercury/default. asp?lang=En&

n=AFE7D1A3-1#Fever).Mercury and the Environment: Products that Contain Mercury. Environment Canada. 2010-06-03. .

[5] "Mercury: Thermometers" (http://www.epa. gov/hg/thermometer-main. html). US Environmental Protection Agency. . "* oral/rectal/baby

thermometers, containing about 0.61 grams of mercury; and

* basal temperature thermometers, containing about 2.25 grams of mercury."[6] "Mercury and Human Health" (http://www.hc-sc.gc.ca/iyh-vsv/environ/merc_e. html).Healthy Living: It's Your Health: Environment.

Health Canada. 2009-03-02. .
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:72007L0051:EN:NOT#FIELD_CZhttp://www.ec.gc.ca/mercure-mercury/default.asp?lang=En&n=AFE7D1A3-1#Feverhttp://www.ec.gc.ca/mercure-mercury/default.asp?lang=En&n=AFE7D1A3-1#Feverhttp://www.epa.gov/hg/thermometer-main.htmlhttp://www.hc-sc.gc.ca/iyh-vsv/environ/merc_e.htmlhttp://www.hc-sc.gc.ca/iyh-vsv/environ/merc_e.htmlhttp://www.hc-sc.gc.ca/iyh-vsv/environ/merc_e.htmlhttp://www.hc-sc.gc.ca/iyh-vsv/environ/merc_e.htmlhttp://www.epa.gov/hg/thermometer-main.htmlhttp://www.ec.gc.ca/mercure-mercury/default.asp?lang=En&n=AFE7D1A3-1#Feverhttp://www.ec.gc.ca/mercure-mercury/default.asp?lang=En&n=AFE7D1A3-1#Feverhttp://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:72007L0051:EN:NOT#FIELD_CZhttp://books.google.com/books?id=lAfa1orgvwQC&pg=PA246http://www.astro.uu.se/history/Celsius_eng.htmlhttp://en.wikipedia.org/w/index.php?title=United_States_Environmental_Protection_Agencyhttp://en.wikipedia.org/w/index.php?title=United_States_Environmental_Protection_Agencyhttp://en.wikipedia.org/w/index.php?title=American_Academy_of_Pediatricshttp://en.wikipedia.org/w/index.php?title=Health_Protection_Agencyhttp://en.wikipedia.org/w/index.php?title=European_Unionhttp://en.wikipedia.org/w/index.php?title=Southeast_Asiahttp://en.wikipedia.org/w/index.php?title=Southeast_Asiahttp://en.wikipedia.org/w/index.php?title=List_of_hospitals_in_the_Philippineshttp://en.wikipedia.org/w/index.php?title=Manila_Adventist_Medical_Centerhttp://en.wikipedia.org/w/index.php?title=List_of_hospitals_in_the_Philippineshttp://en.wikipedia.org/w/index.php?title=List_of_hospitals_in_the_Philippineshttp://en.wikipedia.org/w/index.php?title=Lung_Center_of_the_Philippineshttp://en.wikipedia.org/w/index.php?title=List_of_hospitals_in_the_Philippineshttp://en.wikipedia.org/w/index.php?title=List_of_hospitals_in_the_Philippineshttp://en.wikipedia.org/w/index.php?title=List_of_hospitals_in_the_Philippineshttp://en.wikipedia.org/w/index.php?title=List_of_hospitals_in_the_Philippineshttp://en.wikipedia.org/w/index.php?title=San_Juan_De_Dios_Educational_Foundationhttp://en.wikipedia.org/w/index.php?title=Philippine_Heart_Centerhttp://en.wikipedia.org/w/index.php?title=Philippineshttp://en.wikipedia.org/w/index.php?title=Department_of_Health_%28Philippines%29http://en.wikipedia.org/w/index.php?title=Federal_Ministry_of_Environment


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[7] Clarn newspaper, Argentina starts to say goodbye to mercury thermometers, 14/04/11 (http://www.clarin.com/sociedad/

Argentina-empieza-despedirse-termometros-mercurio_0_462553833. html) (Spanish)

[8] UNEP(DTIE)/Mercury/WG/1/INF/3 Draft Technical Guidelines on the Environmentally Sound Management of Mercury Waste, 2010 (http:/

/www.chem.unep. ch/mercury/storage/LAC_Docs/LAC_storage_RC_INF_5_SBC tech guidelines on ESM waste. doc)

[9] http:/ /zerowastepilipinas.files.wordpress.com/2009/12/01_faye-ferrer. pdf

[10] Salazar T (2008-09-13). "RP hospitals to phase out devices containing mercury" (http://showbizandstyle. inquirer. net/lifestyle/lifestyle/

view/20080913-160332/RP-hospitals-to-phase-out-devices-containing-mercury).Philippine Daily Inquirer. .

[11] UK Health Protection Agency Chemical Hazards and Poisons Report, from the Chemical Hazards and Poisons Division, January 2010 Issue16, p6: Does the Health Protection Agency website prevent harm from breakage of mercury thermometers? (http://www.hpa.org. uk/webc/

HPAwebFile/HPAweb_C/1263812796194)

[12] HPA: Mercury in residential settings: step-by-step guide to cleaning up spills. 2007, updated 6 August 2009 (http://www.hpa. org. uk/

webw/HPAweb&HPAwebStandard/HPAweb_C/1195733821650?p=1158313435037)

[13] Goldman LR, Shannon MW, Committee on Environmental Health (July 2001). "Technical report: mercury in the environment: implications

for pediatricians" (http://pediatrics.aappublications. org/content/108/1/197. full).Pediatrics108 (1): 197205.

doi:10.1542/peds.108.1.197. PMID 11433078. .

[14] "Things are Heating Up with Mercury in Thermometers" (http://yosemite.epa.gov/ochp/ochpweb. nsf/content/heating. htm). Children's

Health Protection. US Environmental Protection Agency. .

External links

"guidelines for mercury spills removal" (http://www.epa.gov/mercury/spills/index.htm). US Environmental

Protection Agency.
http://www.epa.gov/mercury/spills/index.htmhttp://yosemite.epa.gov/ochp/ochpweb.nsf/content/heating.htmhttp://pediatrics.aappublications.org/content/108/1/197.fullhttp://www.hpa.org.uk/webw/HPAweb&HPAwebStandard/HPAweb_C/1195733821650?p=1158313435037http://www.hpa.org.uk/webw/HPAweb&HPAwebStandard/HPAweb_C/1195733821650?p=1158313435037http://www.hpa.org.uk/webc/HPAwebFile/HPAweb_C/1263812796194http://www.hpa.org.uk/webc/HPAwebFile/HPAweb_C/1263812796194http://showbizandstyle.inquirer.net/lifestyle/lifestyle/view/20080913-160332/RP-hospitals-to-phase-out-devices-containing-mercuryhttp://showbizandstyle.inquirer.net/lifestyle/lifestyle/view/20080913-160332/RP-hospitals-to-phase-out-devices-containing-mercuryhttp://zerowastepilipinas.files.wordpress.com/2009/12/01_faye-ferrer.pdfhttp://www.chem.unep.ch/mercury/storage/LAC_Docs/LAC_storage_RC_INF_5_SBC%20tech%20guidelines%20on%20ESM%20waste.dochttp://www.chem.unep.ch/mercury/storage/LAC_Docs/LAC_storage_RC_INF_5_SBC%20tech%20guidelines%20on%20ESM%20waste.dochttp://www.clarin.com/sociedad/Argentina-empieza-despedirse-termometros-mercurio_0_462553833.htmlhttp://www.clarin.com/sociedad/Argentina-empieza-despedirse-termometros-mercurio_0_462553833.html


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Article Sources and Contributors 6

Article Sources and ContributorsMercury-in-glass thermometer Source: http://en.wikipedia.org/w/index.php?oldid=521845730 Contributors: Alai, Andonic, Angrysockhop, Antandrus, Avoided, Bgag, Biglovinb, Black

Squirrel 2, Bobo192, Bongwarrior, Borgx, Bovlk, Bowlhover, BrightStarSky, CambridgeBayWeather, Can't sleep, clown will eat me, CanadianLinuxUser, CardinalDan, Cascade Northern,

Charlieromanello, Chemicalinterest, CommonsDelinker, CrazyPhunk, Dark Lord of the Sith, DavidCary, Dragon-Fire, E-dan, Ed Poor, Epbr123, Erkcan, Femto, Firsfron, Furrykef, Gaelen S.,

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Magioladitis, Marek69, Mauls, Michael Shields, Mion, Mitch199845, Mtys, Oxymoron83, Peterlin, Pflatau, Pol098, PullUpYourSocks, Queenmomcat, RDBrown, Radiojon, Rasbak, RexNL,

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Williamhortner, Wj32, Youssefsan, Zuanzuanfuwa, , 191 anonymous edits

Image Sources, Licenses and ContributorsImage:Maximum thermometer close up 2.JPG Source: http://en.wikipedia.org/w/index.php?title=File:Maximum_thermometer_close_up_2.JPG License: Public Domain Contributors:

CambridgeBayWeather, Christophe.Finot, LimoWreck, Saperaud

File:Termmetro de Lyon.jpg Source: http://en.wikipedia.org/w/index.php?title=File:Termmetro_de_Lyon.jpg License: Attribution Contributors: HeMaCh

File:Quicksilvertermometer Osaby.JPG Source: http://en.wikipedia.org/w/index.php?title=File:Quicksilvertermometer_Osaby.JPG License: Public Domain Contributors: Pieter Kuiper

File:Clinical thermometer 38.7.JPG Source: http://en.wikipedia.org/w/index.php?title=File:Clinical_thermometer_38.7.JPG License: GNU Free Documentation License Contributors: Menchi

File:EU mercury thermometer ban - 28 July 2012.png Source: http://en.wikipedia.org/w/index.php?title=File:EU_mercury_thermometer_ban_-_28_July_2012.png License: Creative

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mercury in glass thermometer.pdf