U

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U is for Unsure, like how we walk through life

-Ullage: Measurement of depth of empty space in a tank, from which the amount of liquid in the tank can be derived, and is found by soundings. Measurement is taken from the top of the liquid to the top of the tank.
 

-UltraViolet (UV) Radiation - electromagnetic radiation with wavelengths longer than x-rays byt shorter than