Boyles’ Law

Definition: Boyle’s Law describes the relationship between Pressure (P) and Volume (V), while keeping moles (n) and Temperature (T) constant.

Relation: P and V are inversely proportional so as P increases, V decreases and vise versa:

Equation: P1V1= P2V2



A empty bottle of water is full of gas. If you would like it take up less space in your recycling bin, then you can apply pressure (↑P) and compress it (↓V), making more room for do-gooding.

Problem: A sample of chlorine gas occupies a volume of 946 mL at a pressure of 726 mmHg. What is the pressure of the gas (in mmHg) if the volume is reduced at constant temperature to 154 mL?

V1=946 ml
P1=726 mmHg
P2= ?
V2=154 mL



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