A liquid mixture is fed to a distillation column. It contains 60% toluene and 40% benzene by mass. The bottom product stream comprises of 10% of the net benzene fed to the column. The overhead (top) stream comprises of a mixture with 90 mole % benzene. The density of the feed mixture is 0.8 kg/L and the feed flow rate is 2500 L/h. Determine the mass flow rates and composition (mass fractions) of all the streams (feed, bottom and overhead).

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.

thats how its supposed to be