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

Oct 12, 2016

$\text{Kilograms, metres, and seconds.}$

#### 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 $\text{Volume = length"xx"length"xx"length}$ $=$ ${m}^{3}$.

$\text{Density}$ is another derived unit:

$\text{Density}$ $=$ $\text{Mass"/"Volume}$, typically (for chemists) units of $g \cdot m {L}^{-} 1$ or $g \cdot c {m}^{-} 3$ are used. These may be related to the base units by the prefix multipliers:

$\text{milli"=10^-3; "centi"=10^-2; "kilo"=10^3;"micro} = {10}^{-} 6$ etc.