To answer the questions, we'll consider the fundamental concepts and definitions within physics regarding pressure and its standard units.
3. Which of the following is the SI standard unit of pressure?
a. atm
b. mmHg
c. Pa
d. torr
The correct answer is:
c. Pa
Explanation:
Pa, or Pascal, is the SI (International System of Units) standard unit for pressure. It is defined as one newton per square meter (N/m^2).
The other units listed (atm, mmHg, and torr) are not SI units but are used in various contexts.
4. Which of the following is equal to the standard pressure?
a. atm
b. mmHg
c. Pa
d. torr
The correct answer here is a combination of options:
a. atm
b. mmHg
d. torr
Explanation:
Standard pressure, which is often used in the context of atmospheric pressure, is commonly agreed to be 101,325 Pa in SI units. It can also be represented approximately as 1 atm (atmosphere), 760 mmHg (millimeters of mercury), or 760 torr. These values are considered equivalent for the standard or normal atmospheric pressure. It should be noted that the term 'standard pressure' has a precise definition when used in scientific contexts, particularly when defining standard temperature and pressure (STP) for measurements and comparisons in chemistry and physics.
