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Pressure and Fluids. Pages 66 – 84 in textbook. What is a fluid?. A substance that has the capacity to flow and assume the form of the container into which it has been poured. What are some examples of fluids?. Water, milk, blood and saliva - PowerPoint PPT Presentation
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Pressure and FluidsPages 66 – 84 in textbook.
A substance that has the capacity to flow and assume the form of the container into which it has been poured.
What is a fluid?
Water, milk, blood and saliva Gases are also considered fluids: air, helium
and ozone.
What are some examples of fluids?
Used to explain how fluids change shape.
Arrangement Of Molecules In The Three States Of Matter – YouTube
Solids, Liquids and Gases - YouTube
The Particle Model.
Is toothpaste considered a fluid? What about sand?
Odd Fluids
Non-Newtonian Fluid on a Speaker Cone - YouTube
Non-newtonian fluids.
1) Compressible fluids: A fluid whose volume can change. GASES.
2) Incompressible fluids: A fluid whose volume cannot be varied. LIQUIDS.
Why are they different? Because the particles behave differently under pressure.
There are two types of fluids:
The result of a FORCE applied in a PERPENDICULAR fashion to a surface.
Pressure
A force is either a PUSH or PULL that changes the movement or shape of an object.
Effect of force on pressure: Force increases = Pressure increases Force decreases = Pressure decreases
What is a force?
If surface area increases = Pressure decreases
If surface area decreases = Pressure increases
Surface area and Pressure
Pressure is equal to the force divided by the area.
Pressure is measured in Pascals (Pa) Force is measured in Newtons (N) Area is measured in square meters (m²)
How to we calculate pressure?
Bill Nye: The Science Guy - Pressure - YouTube
Bed of Nails - Cool Science Experiment - YouTube
Pressure exerted by fluids: When the fluid is incompressible, the force
exerted comes from the mass of the fluid above the object.
Pressure and Fluids, Part 2.
Density is a measure of much matter is “packed together” in a solid/liguid/gas.
The GREATER the density, the GREATER the pressure.
SUMMARY: The pressure exerted on an object by an incompressible fluid depends on –
1. The DEPTH of the object in the fluid.2. The DENSITY of the fluid.
How density affects pressure.
The PRESSURE depends on:
1) The number of particle collisions, with each other or with the sides of the container.
Factors that affect the number of collisions:a) Number of particlesb) Temperature – higher temperature, more
collisionsc) Volume of fluid
Pressure exerted by a compressible fluid
Volume increases – Pressure decreases Volume decreases – Pressure increases
Pressure-Volume Relation ( Kinetic Molecular Theory ) - YouTube
Pressure and the volume of a compressible fluid.
The atmosphere is the layer of air that surrounds the earth. This air is a mixture of gases, and it exerts pressure on everything on the surface.
We measure atmospheric pressure by using a barometer.
QUESTION: What happens to a barometer the higher one goes in the atmosphere?
Atmospheric Pressure
Real World: Heart Rate and Blood Pressure - YouTube
Pressure and the Human body.
