…continued

NOT

kinetic energy

temperature

Thermal Energypotential

energieshttps://www.youtube.com/watch?v=Hsu3JoXN-qU

The particles inside and outside of the house are always moving.- Inside where it’s warmer the particles are moving faster than outside where it is colder.

Temperature ScalesTemperature is given in different

You can measure temperature in three different scales:

Fahrenheit Scale (oF)Celsius Scale (oC)Kelvin Scale (K)

scales

Fahrenheit (oF)Named after German Physicist Daniel FahrenheitMost common in the USA

Freezing point is

Boiling Point is

180 divisions between boiling and freezing.

32 oF

212 oF

Celsius (oC)Named after Sweedish Astronomer Anders Celsius

Most widely accepted around the world

Freezing Point

Boiling Point

Centigrade scale – 100divisions between boiling and freezing.

0 oC

100 oC

Kelvin (K)International standard of scientific measurement

Freezing point

Boiling point

The lowest possible temperature for any material is

If a material is the particles in that materialand would no longer have

This is called

273 K

373 K

0 K

0 Kwould not be moving kinetic

energy

absolute zero

Absolute zero – No more thermal energy (heat) can be removed from matter. (-273oC or 0 K)

Converting UnitsCelsius to Fahrenheit

Formula :

Practice Problem:What would 20oC be in Fahrenheit?

Converting UnitsFahrenheit to Celsius

Formula :

Practice Problem:What would 95oF be in Celsius?

Converting UnitsCelsius to Kelvins

Formula:

Practice problemIf it was 10oC what would it be in Kelvins?

Converting UnitsKelvins to Celsius

Formula:

Practice Problem:If it was 310K what would it be in oC

Measuring Temperature are what we use to

Thermometers tell you the of

the surrounding the thermometer.How it works:The of the tube getsThe particles of the (alcohol) inside

and the liquid .The of the alcohol indicates the

Thermometers

measure temperaturetemperatu

rematter

outside

heatedliquid speeds up

spreads outheight temperatu

re

Thermal ExpansionExpansion, or increase in size of a substance

caused by heat.This occurs in all phases of matter when their

temperature rises.

Knowing how molecules are arranged in a solid, liquid and gas, how do you think thermal expansion will occur in each?

Thermal ExpansionSolid –

Liquid –

Gas -

Expand the least

Expands more than solid but less than gas

Expands the most

Thermal ContractionA decrease in the size of a substance caused

by decreasing temperature.

What happens if you take a balloon outside on a cold day? Why (what happens to the particles)?

The balloon would decrease in size because the particles slow lose thermal energy (which includes kinetic energy) and come closer together.

Using Thermal EnergyRemember:

Energy cannot be Many devices energy from one

form to another or it from one place to another, but the amount of energy .

created or destroyedtransfor

mtransferdoes not change

Heating ApplianceA device that converts

electric energy into thermal energy.

Examples:

Most appliances get warm when plugged in because

A device that regulates the temperature of a system.

Applies the properties of

Thermostats

Curling iron, toaster, clothes iron

thermal expansion

Some electric energy is always converted into thermal energy in an electronic device.