Pressure-volume work (formula for work) (article) | Khan Academy
The kinetic theory of gases is a topic that can explain many everyday effusion shows the relationship between effusion rates and molar mass. Gases do expansion or compression work following the equation: .. The relationship between work, heat, and other forms of energy transfer is further. Gas is a state of matter that has no fixed shape and no fixed volume. is less space for the particles to spread out, and they become compressed. is held constant, volume and pressure have an inverse relationship; that is.
Boyle's law - Wikipedia
Work done by a gas Gases can do work through expansion or compression against a constant external pressure. Work done by gases is also sometimes called pressure-volume or PV work for reasons that will hopefully become more clear in this section!
Let's consider gas contained in a piston.Compressibility Factor (Z-Factor) Equation of State
Pistons are actually used in many mechanical applications all around us, such as inside a gasoline engine. I usually imagine a piston looking very similar to a bicycle tire pump, but here's some more information about what real pistons look like in case you are interested! Here is a picture of the insides of a gasoline engine that shows two pistons side-by-side: A picture of a petrol-engine that has been cut in half to show the cross section of 2 side-by-side pistons.
The Properties of Gases
The piston on the left is arranged with a larger volume than the piston on the right. Schematic of a piston showing the movement of the piston head as the volume inside the piston changes. Two tubes leading to the piston can let gas in and out of the piston to regulate the movement of the piston.
Schematic of piston in movement by R. In a gasoline engine, the pressure inside the piston changes when the fuel is combusted inside the piston, releasing thermal energy and causing the volume inside the piston to increase. The volume inside the piston decreases when the gas is allowed to escape from the piston.
Kinetic Theory of Gases
The Gas Laws The example of the gas-filled balloon can also be used to explore the basic gas laws see also Appendix D, p. In the following, lets assume that the balloon is tight, so that the amount or mass of air in it stays the same: With density being the ratio of mass per volume, the gas density of the balloon thus varies only with its volume when mass is held constant.
If we squeeze the balloon, we compress the air and two things will happen: Since density is mass over volume, and the mass stays constant, the rise in density means that the volume of the balloon decreases: For two states of pressure P1, P2 and two corresponding volumes V1, V2this is stated mathematically: This in turn increases the rate at which the gas molecules bombard the skin of the balloon.
Cooling the balloon down again will make the balloon shrink.
For two states with temperatures T1, T2 and two corresponding volumes V1, V2: It must be noted that in this case and whenever temperature appears in a multiplication or a division the absolute or Kelvin scale must be used for temperature.