Experiment Nine The Specific Heat of a Metal
DATA:
1. Mass of the metal sample.
10.138
2. Mass of water in calorimeter. 18.537
3. Initial temperature of metal sample. 94 °C
4. Initial temperature of water in calorimeter. 28 °C
5. Final temperature of water and metal. 31___"C
CALCULATIONS:
1. Calculate the changes in temperature of the water (aT water) and
of the metal (ATmetal).
T =temperature final - temperature initial
"С ST
°C
2. Calculate the heat energy gained by the water.
Heat energy gained by the water. =
J.
3. The specific heat of meat is
specific heat mass. XAT.
specific heal
Tnator
metal
mask.
X ΔΤ.
Specific heat of the metal
J/g °C
4. Estimated molar mass of metal (using Dulong and Petit's
Law) =
g/mole.

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.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.