Vitamins A, D, E, and K are called the fat-soluble vitamins, because they are soluble in organic solvents and are absorbed and transported in a manner similar to that of fats. Vitamin E deficiency, which is rare and usually due to an underlying problem with digesting dietary fat rather than from a diet low in vitamin E, can cause nerve problems.

A falling barometric pressure, detected by a barometer, signals an approaching thunderstorm. This drop indicates unstable atmospheric conditions, often preceding stormy weather. Meteorologists use barometric readings to predict thunderstorms, as the decrease in pressure signifies the likelihood of imminent weather disturbances and allows for timely weather warnings.