Question

What are the base units for mass, length, and time?

Answer 1

`"Kilograms, metres, and seconds."`

Explanation:

All of these are base units for mass, length, and time respectively. The units for volume depend only on length, and are thus a derived unit.

i.e `"Volume = length"xx"length"xx"length"` `=` `m^3`.

`"Density"` is another derived unit:

`"Density"` `=` `"Mass"/"Volume"`, typically (for chemists) units of `g*mL^-1` or `g*cm^-3` are used. These may be related to the base units by the prefix multipliers:

`"milli"=10^-3; "centi"=10^-2; "kilo"=10^3;"micro"=10^-6` etc.