Definition:Torr

Definition

The torr is an metric unit of pressure.

It is defined as being:

The amount of pressure equal to exactly $\dfrac {101 \, 325} {760}$ pascals.

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$\ds 1$

torr

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$\approx$

$\ds 0 \cdotp 99999 \, 98575 \, 33699$

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$\approx$

$\ds 133 \cdotp 32236 \, 8$

$\mathrm {Torr}$

The symbol for the torr is $\mathrm {Torr}$.

The $\LaTeX$ code for $\mathrm {Torr}$ is \mathrm {Torr} .

This entry was named for Evangelista Torricelli.

The torr was originally defined to be the same as one millimetre of mercury, but since that time both definitions have been altered slightly.

Hence the torr and the millimetre of mercury have diverged ever so slightly so they are now different by about $0 \cdotp 00001 \, 5 \%$.