How do you express 275 mmHg in atm. and Pascal?

Question

Cameron Andrews · Accepted Answer

#1# #"atm"# #=# #760# #mm*Hg# #=# #101.32# #kPa#

Of course, pressure is not measured in millimetres of mercury, but in force per unit area. If you go thru the math, and I don't propose to do so, it turns out that a column of mercury #760# #mm# high exerts a force per unit area, a pressure, of #1# #atm#, or #101.32# #kPa#.

Thus #275# #mm# #Hg# #=# #(275*mm*Hg)/(760*mm*Hg*atm^-1)# #=# #"approx. 0.4 atm"# or,

#(275*mm*Hg)/(760*mm*Hg*atm^-1)xx101.32*kPa*atm^-1# #=# #??kPa#

A mercury barometer has long been used to measure pressures; most laboratories would have an old, typically beautifully made one somewhere on their premises. It was a very convenient way to measure small pressures when doing a distillation.

These days, the use of mercury is not so prevalent due to environmental concerns. Mercury in the lab tends to be fascinating, and sometimes students play with it, i.e. float coins on it, use it for electrical switches, dissolve alkali metals in it (I know I did). Inevitably, it all goes pear shaped, and you spill mercury on the floor or the desk, where it inhabits every crack. Water barometers are not so popular, because #1# #atm# will support a column of water approx. #10# #m# high. #1# #atm# will support a column of mercury #760# #mm# high - water is so much less dense than mercury.

Cameron Andrews · Answer

275 mm Hg = 0.36 atm or 36477 pa

760 mm Hg is equal to 1 atm. The two conversion factors can be written. 760 mm Hg / 1 atm or 1 atm / 760 mm Hg 1 atm < 760 mm Hg x 275 mm Hg 0.36 atm 101325 pa = 1 atm Two conversion factors are possible to write. 101325 pa / 1 atm or 1 atm / 101325 pa 101325 pa / 1 atm x 0.36 atm 36477 pag

Ellie Andrews · Answer

undefined To convert 275 mmHg to atm: 0.3619 atm
To convert 275 mmHg to Pascal: 36666.75 Pa

Naomi Aronson · Answer

undefined To express 275 mmHg in atm and Pascal:

1. Convert mmHg to atm:
$$ \text{1 atm} = 760 \text{ mmHg} $$
$$ \text{275 mmHg} \times \frac{1 \text{ atm}}{760 \text{ mmHg}} = 0.3618 \text{ atm} $$

2. Convert mmHg to Pascal:
$$ 1 \text{ mmHg} = 133.322 \text{ Pascal} $$
$$ \text{275 mmHg} \times 133.322 \text{ Pascal/mmHg} = 36613.05 \text{ Pascal} $$

So, 275 mmHg is approximately 0.3618 atm and 36613.05 Pascal.

Mateo Aguilar · Answer

undefined To express 275 mmHg in atm, divide 275 by 760, which is the conversion factor from mmHg to atm. This gives you approximately 0.3618 atm.

To express 275 mmHg in Pascal, multiply 275 by 133.322, which is the conversion factor from mmHg to Pascal. This gives you approximately 36626.55 Pascal.