Aperfectly mixed non-isothermal adiabatic reactor carries out a simple first-order exothermic reaction, aàbin the liquid phase. the product from the reactor is cooled from the output temperaturettotcand then introduced to a separation unit where the un-reactedais separated from the productb. the feed to the separation unit is split into two equal parts top product and bottom product. the bottom product from the separation unit contains 95% of the un-reactedain the effluent of the reactor and 1% ofbin the same stream. the bottom product which is at temperaturetc(since the separation unit is isothermal) is recycled and mixed with the fresh feed of the reactor and the mixed stream is heated to temperaturetfbefore being introduced to the reactor. write the steady state mass and energy balances for the whole process assuming constant physical properties and heat of reaction. discuss also the degree of freedom of the resulting model.

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.