Pressure and Volume The relationship among pressure, volume, and temperature when liquid and gaseous fluids are compressed or heated is: 1. Increasing.

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Presentation transcript:

Pressure and Volume The relationship among pressure, volume, and temperature when liquid and gaseous fluids are compressed or heated is: 1. Increasing the pressure on a gas results in a decrease in volume (temperature being held constant). This relationship is now known as Boyle’s law.

Examples of Pressure and Volume Examples: carbon dioxide cartridges used in paint ball guns spray paint whipped cream in an aerosol can compressed air toys (Air Hogs™ and Nerf ™ guns) aerosol hair spray

Pressure, Volume, and Temperature 2. Increasing temperature of a gas results in: (i) an increase in pressure (volume constant) and (ii) in an increase in volume (pressure constant)

Examples of Pressure and Temperature Examples: Gas pressure inside an aerosol causes liquid to spray out rapidly. If the can will not spray any more, the pressure has been reduced. However, the can is still sealed so when it is heated the pressure goes up. As the pressure increases and particles have nowhere to go, the heated aerosol can might explode.

Examples of Pressure and Temperature A cooking device called a pressure cooker uses steam, which cannot escape) at very high temperatures and pressure to cook food more quickly.

Complete the Following: 1. Why must the temperature be held constant when you are doing an experiment to determine the relationship between the pressure on a gas and the volume of the gas? 2. What happens to the volume of a gas when you exert pressure on it? Assume that the temperature of the gas remains constant while you are exerting the pressure on it. 3. Describe one practical application of the relationship between the pressure and the volume of a gas.

4. When you increase the temperature of a gas and hold the pressure constant, what happens to the volume of the gas? 5. When you are doing an experiment to measure the effect of increasing temperature on the pressure of a gas, what variable must be held constant? 6. What happens to the pressure of a gas when you increase the temperature of the gas?