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20 Cards in this Set
- Front
- Back
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Define physically what pressure is inside of a fully inflated soccer ball?
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Molecules of air are in constant motion inside of the soccer ball and exert pressure when they strike the walls of the ball.
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What could happen (worst case) if a pressurized aerosol can at your home (e.g. Wasp spray can) gets consumed in a fire?
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It could heat up, causing pressure inside of the can to increase until the can exploded!
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Is pressure related to temperature?
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Yes.
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If the temperature goes down, then what happens to pressure?
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Pressure drops as well.
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What are some typical units used to measure pressure?
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lbs/square inch
psi N/square meter atm (atmospheres) |
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How are temperature and gas pressure related?
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Temperature and pressure are proportional (i.e. as temperature drops, pressure drops. As temperature increases, pressure increases.
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Is pressure measured in force/unit area?
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Yes.
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What is a barometer used for?
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To measure atmospheric pressure. Meteorologists use it a lot.
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What is the typical atmospheric pressure on earth?
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1 atm
14.7 psi 760 mm Hg 101.3 kPa |
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What is 35 psi equivalent to in units of kPa?
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240 kPa
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At atmospheric pressure, a balloon contains 2.00 L of nitrogen gas. How would the volume change if the Kelvin temperature were only 75 percent of its original value? What would the new volume be?
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The volume would decrease. The volume would be 1.5 liters.
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A cylinder containing 32 g of oxygen gas is placed on a weighing scale. The valve is opened and 16 g of gas is allowed to excape. How will the pressure change? What is the new pressure?
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The pressure will decrease in the cylinder. The new pressure is half of the original pressure.
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Please state Boyle's law.
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Pressure α 1/Volume at constant temperature.
Said verbally: Pressure is inversely proportional to volume at constant temperature. |
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Who is Boyle's law name after and what century did he live?
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Robert Boyle, 1600s.
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How will a weather balloon keep changing the higher it rises in the atmosphere? Why?
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Its volume will get bigger. The pressure outside of the balloon is decreasing.
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State Charles's Law.
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Volume α Temperature (K) at constant pressure.
Verbally stated: Volume is directly proportional to temperature at constant pressure. |
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What explains the volume of a balloon decreasing with cooler temperature?
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Kinetic theory of matter.
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What does STP stand for?
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Stardard Temperature and Pressure.
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What are STP conditions?
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0.00ºC and 1 atm.
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How does the pressure in a bicyle tire compare to atmospheric pressure?
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It is several times higher.
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