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.
More blood to the hands means pink, warmer hands; less blood flow means colder and sometimes painful hands. Blood that flows into our hands usually travels by two arteries: the radial artery and the ulnar artery (Figure 1). Cold hands are caused when blood flow is decreased to the hand.