The heat of a reaction may be found with the equation q=mcδt. a hot pot is set on a 2.51 kg slab of granite. the temperature of the granite increases from room temperature, 23.5°c, to 98.6°c. calculate the heat absorbed by the granite given that the specific heat capacity of granite is 0.79 j/(g*°c). a) 47 kj b) 129 kj c) 149 kj d) 196 kj

the atomic mass is the bottom number on the element.

-steel jelly

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.