Question

A student reads a barometer in the laboratory and finds the prevailing atmospheric pressure to be 745 mmHg. Express this pressure in torr and in atmospheres.

Answer 1

Answer : The pressure in torr and in atmospheres are, 745 torr and 0.980 atm respectively.

Explanation :

As we are given that the atmospheric pressure is, 745 mmHg.

Now we have to determine the pressure in torr and atm.

Conversions used:

1 atm = 760 mmHg

1 atm = 760 torr

1 mmHg = 1 torr

As, 760 mmHg = 1 atm

So, 745 mmHg = $\frac{745mmHg}{760mmHg}\times 1atm=0.980atm$

and,

As, 1 mmHg = 1 torr

So, 745 mmHg = 745 torr

Therefore, the pressure in torr and in atmospheres are, 745 torr and 0.980 atm respectively.