Carbons in graphite and benzene both exhibit sp2 hybridization with one leftover 2p electron. What is the difference in the function of the 2p electron in graphite versus the 2p electron in benzene? a. There is no difference. The 2p electrons form and break double covalent bonds with other carbons in the compound.
b. The 2p electrons in benzene are delocalized to form the resonance structure, but the 2p electrons in graphite are not delocalized, and they form single sigma bonds with other carbons.
c. The delocalized 2p electrons in graphite help the graphite layers stick together electrostatically while in benzene the 2p electrons form resonant double bonds.
d. The 2p electron in graphite jumps to a higher energy level to form carbon bonds characteristic of a diamond, while the 2p electron in benzene forms a strong single bond with a neighboring carbon.

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.