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.
People from Brazil and Argentina do also believe in the use of Horned Hand sign for fending off ill fate by conjuring some supernatural power. Nowadays Horned Hand gesture has become an inevitable part of the American Heavy Metal and Rock. This hand sign is well-known as devil sign, metal horns, or Rock on! sign. Besides being used as an occult symbol Horned Hand gesture is also quite popular in different parts of America for its use in sports without invoking any demonic association.