Question

$1$ atm equals to:
A.$1$ torr
B.$76$ torr
C.$760$ torr
D.$100$ torr

Answer 1

The given both terms are the units of pressure and we have to explain the relation between them.For pressure, the SI system's basic unit is Pascal (Pa), which is $N/m^2$ (Newton per square meter, while Newton is $kgm/s^2$). Pascal is a very small pressure unit and for example the standard atmospheric pressure is 101325 Pa absolute

Complete step by step answer:
As we know that atm is fully known as standard atmospheric pressure. Atm and torr are the units of pressure. Pressure is a force exerted by a substance per unit area of another substance. Moreover it is also defined as the force that a gas exerts on the walls of its container. Pressure is a scalar quantity meaning it has a magnitude, but not a direction. Pressure is determined by the flow of mass from a high pressure region to a low pressure region. SI unit of pressure is pascal (Pa). The other unit of gas is bar. We have to answer the value of $1$ atm in terms of torr. As we know that $1$ torr is $0.00131$ atm, so we can say that $1$ atm is $760$ torr.
Hence, option C is correct.
Additional information: Similarly we can relate all the units of pressure. $1$ atm is also equal to $101325$ Pa and is also equal to $1.013$bar. $1$bar is equal to$\;100000$ Pa and is equal to $750.062$ torr. Also $1$torr is equal to $0.00133$ bar, $0.00131$ atm and $133.32$ Pa.

Note: Remember that $1$ atm is also equal to $760$mm of Hg. This means that $1$ torr= $1$ mm of Hg. Air also exert pressure on our body but it is so small (approximately negligible) that we can't feel it. But as we go higher towards the sky, the pressure of air on our body increases and we can experience it easily. Similar is the case when we go deep in the water, the pressure of water also increases and we can easily feel it.