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Best Answer: w/w- an abbreviation for by weight, used in chemistry and pharmacology to describe the concentration of a substance in a mixture or solution ...
P stands for pressure. V stands for volume. n stands for the number of moles of gas. T stands for temperature. R is a little tricky, you could change the formula by using diff â¦ erent units, R changes in value depending on what units you use in order to balance the equation.