A centimetre or a millimetre for everyday objects. Or micrometre for things still smaller - eg thickness of a hair.
Or if you are talking abount things on a very, very tiny scale, a nanometre or picometre. And that's not the end of metric prefices!
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A child that is about 5.
road distances in km. measurements in metres or even smaller
Deci means tenth, so decimeter would be a tenth of a meter. Decimeter is smaller then.
The official unit for volume is the cubic meter, but since this is a somewhat large unit, smaller units are sometimes used. A ml (milliliter) is the same as a cubic centimeter, or a millionth of a cubic meter.
centimetres