12.2.5 Que Properties of Matter Question 2 of 10
The surface tension of isopropyl alcohol in air has a value of 22 39 units and
the surface tension of water in air is 72.86 units. Which iwo statements are
true?
A sopropyl alcohol will have a more curved meniscus than water
because the forces between the molecules are greater
B. Isopropyl alcohol will have a higher boiling point than water
because the forces between the molecules are greater
o Isopropyl alcohol will have a flatter meniscus than water because
the forces between the molecules are smaller
D. Isopropyl alcohol will have a lower boiling point than water
because the forces between the molecules are smaller

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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