Stripping ammonia from air into water (backhurst ex. 2-2 modified) it is desired to produce 100 kg of a solution of ammonia in wate rcontaining 10% by mass of ammonia. this will be achived by stripping ammonia from an ammonium-air mixture by water in a counter-current absorption tower. the inlet gas stream contains 20% ammonia by mass and the outlet gas 2% ammonia by mass. assume that air and water do not mix during the process. a) draw a process diagram. b) determine dof c) calculate the mass of ammonia-air which should be fed to the column.

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.