Weight is a measurement of the force placed on an object by gravity, whereas mass is the amount of matter an object contains. Mass is commonly denoted using m or M, and weight is denoted with W. More » Science Measurements

Atomic mass is the mass of a single atom or an individual isotope. The atomic weight is the average mass of all naturally occurring isotopes of an element. More » Science Chemistry Atoms & Molecules

Molecular mass is expressed as the mass of a molecule in unified atomic mass units, while the number average molecular weight is expressed as the total weight of all molecules in a substance, divided by the overall numbe... More » Science Measurements
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Mass is the measurement of how much space an object takes up, and weight is the measurement of the pull of gravity on an object. Scientists measure both mass and weight with the use of balances and scales. The formula we... More » Science Measurements

Mass is the measurement of the amount of matter that an object contains, while weight represents the gravitational pull on a mass. Physicists calculate the weight of an object by multiplying its mass by the gravitational... More » Science Physics Motion & Mechanics

Spring scales measure the magnitude of forces, most commonly weight, which is the downward force of gravity on an object. It works from the principle laid down by Isaac Newton in his third law of universal motion, that f... More » Science Measurements

A gram is a measurement of mass, or the amount of matter something contains, and a teaspoon is a measurement of volume, or the amount of space something takes up. Therefore, it isn't possible to precisely convert teaspoo... More » Science Measurements