Assume that a lecture hall is 5 m wide, 3 m high and 9 m deep; assume that the molar composition of the air in the room is 80% n2 and 20% o2; assume that the temperature and pressure in the room are such that the molar gas volume, rt/p = 20 l/mol; and assume that van der waals b of o2 is 0.03 l/mol. use this information to estimate to one significant figure the volume in liters of liquid o2 that could be made by condensing to liquid the air in the lecture hall. comment on whether your answer is in line with your explanation.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

the answer is 0.8m.

by: nicholas