What is used to measure specific gravity?

Answer 1

a) Mohr Balance: devised by Karl F. Mohr

b) Pycnometer Method

• pycnometer - a small glass bottle with a ground glass stopper through which a hole is bored

- the bottle is weighed empty, then full of water, the full of the given liquid.

c) Hare's Method: devised by Robert Hare

- measure specific gravity by balancing the pressure cause by a column of a given liquid against the equal pressure caused by a column of water.

d) Use of Hydrometer

• for rapid measurement of the approximate specific gravity of a liquid.
• hydrometer - has a long stem with Hg(Mercury) at it's lower end to make it float upright in the liquid being measured; graduations in the stem indicate the value of the specific gravity.

Answer 2

The instrument is called a Hydrometer.It consists of a clear tube with a suction bulb at one end and a smaller tube at the other.Inside the tube is a calibrated glass float suitable for the liquids being measured.

Answer 3

Specific gravity is the ratio of the density of gas to the density of air.

First the density of the gas is determined.

Density is the mass of a unit volume of the substance in constant temperature (20 0C) and pressure ( 1 Bar).

Like solids Gas have mass as it is only a change in the state of the matter.A container of unit volume x m3 will have y kg mass . The density will work out to be y kg / x m3 . The mass of the gas can be determined by the weight of the container plus gas - minus the weight of the container.

The density of the gas in ratio with the density of air (1 kg/m3) gives the specific gravity of the gas in a ratio number.

If the gas is less denser than air it will be <1 while if it is more denser than air it will be >1. .

Answer 4

specific gravity = relative density ( relative to water), water is 1000 kg / cubic metre, say iron is 7800 kg / cubic metre, then relative density is:

7800/1000 = 7.8, or 7.8 times the density of water

Answer 5

Specific gravity is often measured by a hydrometer.

Answer 6

The symbol for gravity is simply a g.

Isn't there also a Capital Y with a spike up the middle? No keyboard delineation.

Answer 7

By a prime minster

Answer 8

rho or d