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.
The Corna. Hand gestures can have multiple meanings. Perhaps one of the best examples of this is the hand horn, also known as the corna, where only the pinky and the index finger point up while the other fingers are held in the palm under the thumb. If you're in Italy or Spain and you flash this sign towards a man, you might get beaten up.