M = M that is L at R TLetter Equations are well known phrases or facts where the key words have been replaced with the first letter of that word. These are often in the form of an equation, which contain a number, an = sign and the rest of the obscured phrase or fact.
M = M that is L at R T
HintIt's commonly used to measure temperature and pressure.
AnswerMercury = metal that is liquid at room temperature.
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