For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship, when temperature is held constant. If volume increases, then pressure decreases and vice versa, when temperature is held constant.
Yeah, except when it's not. The two fingers held aloft in a V are fine provided your palm is facing out, but in some countries -- namely, Australia, New Zealand, and the United Kingdom -- it's an insult of the first order if you make the same gesture but with your palm facing inward.
It is a non-verbal mode of communication, wherein we show up different movements of hands and fingers accompanied by various kinds of facial expressions. Hand gestures have a wide range of meanings, and they are also emblematic of different religious and cultural traditions. Every individual movement has a meaning symbolizing various forms of perceptions.