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What is 150 mm expressed in decimeters?
##150 mm div 10 div 10 = 150/(10xx10) = 1.5dm##
Although decimeters exist, they are seldom used in this form. We prefer to use metres, centimetres and millimetres.
We would say 20 cm rather than 2 dm, although the length is the same.
The conversion between the units of length is by a factor of 10 each time.
Multiply by 10 to covert to the next smaller unit or divide by 10 to change to the next bigger one.
##150 mm div 10 div 10 = 150/(10xx10) = 1.5dm##
However decimetres are important because they offer another link between length and capacity.
A cube that is
##10cmxx 10cmxx 10 cm## is the same as ##1 dm^3##
It holds exactly 1 litre.
So we have:
##1 cm^3 = 1cc = 1ml##
##1 dm^3 = 1 litre##
##1 m^3 = 1 Kl ##
The conversion factor between these is 1000.