But friction is not the only cause of water blisters. Burns can also cause very painful water blisters, especially second degree burns, as can allergies and even some viruses like chickenpox or shingles. Blisters that occur on hands and feet are commonly classified as water blisters.
ASTRONOMICAL UNIT (AU) 1 AU = 149,597,870.700 kilometers (or 149,597,870,700 meters) Definition: An Astronomical Unit is the mean distance between the Earth and the Sun.
Define: Rack Unit âUâ or âRUâ. The hole spacing for standard 19â³ racks on the mounting flange is spaced in groups of three holes. This three hole group is defined as a Rack Unit (RU) or sometimes just call a âUâ. 1U occupies 1.75â³ (44.45 mm) of vertical space. Manufacturers of rackmount equipment make their product lines based upon how many RUs that the equipment occupies in the server rack.