Convert one atmosphere to torr

Explanation

To convert one atmosphere to torr all we need is to know the conversion factor and we are done. Luckily, we can compute that factor using the units' definitions below.

We find that one atmosphere is equal to 760 torr.

Formula

1 atm = 760 Torr

atmospheresatm

dimension	pressure
symbol	atm

The standard atmosphere (atm) is a unit of pressure.

It is approximately equal to the atmospheric pressure on Earth at sea level.

Definition of the atmosphere

One standard atmosphere is equal to 101325 Pa.

10^th CGPM (1954) p. 80

History

The standard atmosphere is used during the 9^th CGPM in the definition of the international temperature scale with the value of 1013250 dynes per square centimetre. That definition is reiterated during the 10^th CGPM with the mention "for all use" and the equivalence of 101325 newtons per square meter is added (and as you all know, 1 pascal is equivalent to 1 newton per square meter).

Equivalences

One standard atmosphere is equivalent to:

Some Facts

For every 10 meters you go down under water, the pressure increases by one atm.
Venus's surface atmospheric pressure is more than 90 atm.
The atmospheric pressure at the top of Mount Everest is approximately 0.33 atm.

torrTorr

dimension	pressure
symbol	Torr

The torr (Torr) a deprecated unit of pressure.

Definition of the torr

One torr is equal to ¹⁰¹³²⁵⁄₇₆₀ pascals.

The International System of Units 1^st edition p. 16

Equivalences

One torr is equivalent to:

History

The torr and millimeter of mercury were once exactly equivalent before their respective definitions diverged when the torr was redefined as 1/760 of the standard atmosphere. The two units are still very similar, one torr behing approximately equal to 0.999999858 millimeter of mercury.

The unit is named after Evangelista Torricelli, an Italian physicist who discovered the principle of the barometer.

Other torr units

millitorr	mTorr	0.001
torr	Torr	1
kilotorr	kTorr	1000
megatorr	MTorr	1 000 000