# How to interpret the appearance of time units in the units of a physical quantity?

Or phrased more abstractly, how to interpret the appearance of time dimension $[time]$ in the dimension of a physical quantity?

For example, the dimension of pressure is $[mass] [length]^{-1} [time]^{-2}$ corresponding to the SI-unit Pascal.

When you calculate pressure, you do not have to know any time. It is simply force per area – a division. There are many units that have time as component in them.

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Yes, but force is acceleration (times mass) so it needs time and has per second per second. – MBN Jan 26 '12 at 16:55