Boyle's Law
Boyle's Law states the volume of a definite quantity of dry gas is inversely proportional to the pressure, provided the temperature remains constant.
Mathematically Boyle's law can be expressed as P1V1 = P2V2
- V1 is the original volume
- V2 is the new volume
- P1 is original pressure
- P2 is the new pressure
Suppose you have a gas with 45.0 ml of volume and has a pressure of 760.mm. If the pressure is increased to 800mm and the temperature remains constant then according to Boyle's Law the new volume is 42.8 ml.
(760mm)(45.0ml) = (800mm)(V2)
V2=42.8ml
Charle's Law can be stated as the volume occupied by any sample of gas at a constant pressure is directly proportional to the absolute temperature.
V / T =constant
- V is the volume
- T is the absolute temperature (measured in Kelvin)
Charles's Law can be rearranged into two other useful equations.
V1 / T1 = V2 / T2
- V1 is the initial volume
- T1 is the initial temperature
- V2 is the final volume
- T2 is the final temperature
V2 = V1 (T2 / T1)
- V2 is the final volume
- T2 is the final temperature
- V1 is the initial volume
- T1 is the initial temperature
Important: Charles's Law only works when the pressure is constant.
Note: Charles's Law is fairly accurate but gases tend to deviate from it at very high and low pressures.
No comments:
Post a Comment