Atmospheric Pressure:
One atmosphere is the pressure of air that can support a 760 mmHg column at sea level. It is
the average pressure of the atmosphere at sea level and is equivalent to 101.325 kilopascals (kPa).
Other Units:
The unit torr is equivalent to 1 mmHg and is commonly used in expressing pressure. Additionally,the
unit pounds per square inch (psi) is widely used in engineering work, with 1 atm equal to 14.7 psi. Another
common
unit used by meteorologists is millibar.
What is the SI unit of pressure?
The SI unit of pressure is expressed in Newton per square meter ( Nm-2 ).
Define one atmosphere of pressure.
One atmosphere of pressure is the force exerted by a 760 mmHg column of mercury at sea level.
How is pressure commonly measured in engineering work?
Pressure is commonly measured in pounds per square inch (psi) in engineering work.
What is the relationship between torr and kilopascals?
760 torr is equal to 101.325 kilopascals.
Explain the unit millibar and its usage.
The unit millibar is commonly used by meteorologists to measure atmospheric pressure.
Which unit is commonly used by meteorologists for pressure measurement?
a) torr
b) atm
c) mmHg
d) millibar
Answer: d) millibar
What is the pressure in pounds per square inch equivalent to one atmosphere?
a) 760 psi
b) 14.7 psi
c) 1 psi
d) 7600 psi
Answer: b) 14.7 psi
How is one atmosphere defined in terms of pressure supported by a column of mercury?
a) 760 mmHg
b) 1000 mmHg
c) 500 mmHg
d) 200 mmHg
Answer: a) 760 mmHg
Which unit of pressure is most commonly used in engineering work?
a) atm
b) torr
c) psi
d) pascal
Answer: c) psi
How is the pressure of air at sea level defined in terms of mmHg?
a) 500 mmHg
b) 1000 mmHg
c) 760 mmHg
d) 200 mmHg
Answer: c) 760 mmHg