At a constant temperature, a gas occupies a volume of `200 mL` at a pressure of `0.720"bar"`. It is subjected to an external pressure of `0.900"bar"`. What is the resulting volume of the gas?

Explanation

Boyle's law is applicable as the amount and temperature are unaltered
`p_(1)V_(1)=p_(2)V_(2)`
or `p_(1)//p_(2)=V_(2)//V_(1)`
substituting the values, we get
`0.720 "bar"//0.900 "bar"=V_(2)//200 mL`
`V_(2)=(720)/(900)xx200 mL=160 mL`
Boyle's law is manifested in the working of many devices used in daily life such as cycle pump, aneriod barometer and type pressure gauge , etc.