What is meant by a partial presuure?

Explanation

The pressure exerted by a gas at the same conditions of volume and temperature if no other gases were present is called partial pressure.
`"Note": " " p=mu_(1)(RT)/(V)+mu_(2)(RT)/(V)+.........`
`i.e.,P=(RT)/(V)(mu_(1)+mu_(2)+.........)`
`P=(RT)/(V)((mu_(1))/M_(1)+(mu_(2))/(M_(2))+.........)`
`i.e.,P=P_(1)+P_(2)+P_(3)+.........`