The weight of one raisin or one sugar packet.
A US nickel weighs 5 grams.
G always sounds like "guh" in front of consonants, A, O, and U. Before E and I it usually sounds like J.
A measure of how much stuff or thickness something has in it.
A cannonball has more mass than a balloon even though they are the same size.
Don't forget this word has two Ss and the ending is -es for more than one: three masses.