Anormal breath of air is about 1.00 l. if the air is drawn in at 18.0 ∘c and is warmed to 35.0 ∘c, what will be the new volume of the air? assume that the pressure and amount of the gas remain constant.

The new volume of the air is 1.05 liters.

Explanation:

By Charles's law, we can make a relation between temperature and volume, where the volume of a gas (always in constant pressure) is directly proportional to its absolute temperature (T° in K)

So, when the temperature is increasing, volume increases

and when the temperature decreases, volume decreases.

V1/T1 = V2/T2

T° in K = T ° in C + 273

18°C + 273 = 291 K

35°C + 273 =308 K

1 L/291K = V2/308K

(1L /291K). 308K = V2

1.05 L = V2

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.

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