Pressure is created when particles apply a force to an object.
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As temperature decreases
Particles lose kinetic energy Particles apply less force to the surface Pressure decreases
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As temperature increases
Particles gain kinetic energy Particles apply more force to the surface Pressure increases
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Pressure Changes:
...
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1.
At constant temperature, if the volume decreases then the pressure increases
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2.
At constant temperature, if the volume increases then the pressure decreases
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Equation pt.1
Pressure x volume = constant
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Equation pt.2 - How we can write it
pbefore x Vbefore = pafter x Vafter
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Example of Guess Method - Question
Initially the pressure of a balloon is 60 Pa and has a volume of 0.5m3 . What is the pressure when the volume is decreased to 0.25m3?
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Example of Guess Method Working - Out
G. pbefore = 60 Pa, Vbefore = 0.5 m3 , Vafter = 0.25 m3 U. pafter E. pbefore x Vbefore = pafter x Vafter S. 60 x 0.5 = pafter x 0.25 S. 30 = pafter x 0.25 30 ÷ 0.25 = pafter Pafter = 120 Pa
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Other cards in this set
Card 2
Front
Pressure is created when particles apply a force to an object.
Back
Definition
Card 3
Front
Particles lose kinetic energy Particles apply less force to the surface Pressure decreases
Back
Card 4
Front
Particles gain kinetic energy Particles apply more force to the surface Pressure increases
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