weight

• how heavy something is.
• in everyday life, mass is often called weight
but mass and weight are not the same,
mass is the quantity of matter in an object and doesn't change but
the weight of an object changes according to gravity.
• A brick would be weightless in space,
even though it still has the
same mass as on earth.

• weight and mass are measured using scales.
•  they are often measured with the same units
e.g. kilograms or pounds.

EXAMPLES:

Metric Units ~ Mass, Weight

1000 milligrams = 1 gram
1000 grams = 1 kilogram
1000 kilograms = 1 tonne

Abbreviations
milligram mg gram g
kilogram k tonne t

Imperial/Customary Units ~ Mass, Weight

437.5 grains = 1 ounce
16 ounces = 1 pound
14 pounds = 1 stone
8 stones = 1 hundredweight (UK)
100 pounds = 1 hundredweight (US)
20 hundredweight = 1 ton
1 ton = 2240 pounds (UK)
1 ton = 2000 pounds (US)