With suitable use of the decimal point, any object can be measured in centimetres. Your palm is a few cm across. The length or height of a normal pet would be measured in cm. Peoples' height is measured in cm although they may be expressed in metres. Similarly, larger objects such as rooms may be measured in metres but, for precision, cm will be used.
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cm
NO! It's measured in cm2
No problems provided they state which units. Most scientists are capable of converting between units.
Mass is measured in grams and kilograms. A gram is very light, about as light as a paperclip. A kilogram is 2.2 lbs, so it is more useful for everyday objects. Things such as people, furniture, cars, etc. could be measured in kilograms while objects like paper, small amounts of gold, or mail could be measured in grams. 1 kilogram is equal to 1000 grams.
Objects composed of tiny amounts of mass.