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76. What is the definition of "gas"?


76.A "gas" is a substance in which the molecules are separated on the average by distances that are large compared with the sizes of the molecules.




77. What is standard temperature and standard pressure?


77.0 C and 1 atm pressure

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5. Give the common units for pressure.
A) mmHg, atm, kPa
B) mmH2O, atm, Pa
C) mmH2O atm, kPa
D) mmHg, atm, liters

6. The column of mercury in a barometer is supported by a reservoir of water.
A) True
B) False

The column of mercury in a barometer is supported by atmospheric pressure
كتاب شانج صفحة 177 تحت الرسمة 5.3

7. Most manometers are used to measure atmospheric pressure.
A) True
B) False

Most manometers are used to measure pressure

صفحة 178 من تعريفه

8. Why is mercury a more suitable substance to use in a barometer than water?
A) mercury is less dense than water
B) mercury has a higher freezing point than water
C) mercury is more dense than water
D) mercury doesn't vaporize