Units of paper quantity of 480 sheets, now known as a 'short' ream. Reams of 472 and 516 sheets are still current, but in retail outlets paper is typically sold in reams of 500. As an old UK and US unit, a perfect ream was equal to 516 sheets. Certain types of specialist papers such as tissue paper, greaseproof paper, handmade paper, and blotting paper are still sold (especially in the UK) in 'short' reams of 480 sheets (20 quires of 24 sheets). However, the commercial use of the word 'ream' for quantities of paper other than 500 is now deprecated by such standards
Paper and ink testing Paper sheets are cut to a size of 10 cm x 10 cm, then the sheets are massed individually. The mean of the masses is used to calculate the mass of the paper per square meter, and the standard deviation is determined from all samples. If the mass is higher than specified, it is a loss for the publisher. Defines the thickness of the paper.Consistency of caliper throughout the paper web is an important consideration.An abrupt increase or decrease in caliper can affect the extent to which the printing plate or blanket contacts the paper and transfers a complete printed