pls tell me to measure the specific gravity..without any errror...??

Question

scl2 specific gravity at 20°c.

Answer 1

>Use a good hydrometer.<

Answer 2

I have found the use of a pycnometer to be the most convenient and accurate, provided you have an accurate scale. All a pycnometer is, is an accurate volumetric flask. Using the principle of density=mass/volume, if you measure the mass of a given volume you have the density (and hence the SG). Only a small volume is required (eg 25-50 ml).

Here is what wikipedia says "A pycnometer is a flask with a close-fitting ground glass stopper with a fine hole through it, so a given volume can be accurately obtained. The name comes from the Greek puknos, a word meaning "density." If the flask is weighed empty, full of water, and full of a liquid whose specific gravity is desired, the specific gravity of the liquid can easily be calculated. [SG = W(grams) / V(mL)] A sample in the form of a powder, to which the usual method of weighing cannot be used, can be put into the pycnometer. The weight of the powder and the weight of the displaced water can be determined, and from them the specific gravity of the powder."

Another way is to use an accurate hydrometer in the right range. Float it in the liquid and read off the density. For more information on a hydrometer look here: http://en.wikipedia.org/wiki/Hydrometer

Answer 3

To measure specific gravity, divide the density of your sample by the density of pure water at the temperature you are measuring at. The best way to do this is to use larger samples when finding the density, to minimize error. Use really good measurement tools to minimize error as well. It is impossible to have no error at all, but you can get pretty close.

Answer 4

What specific gravity you want???

Specific Gravity for Oil..??
Specific Gravity for Water..??
Specific Gravity for Liquid..??
or Atmosphere specific gravity.???

Answer 5

You cannot measure anything "without error". There is always a degree of inaccuracy, and therefore, there is always error.

Answer 6

OK Raju. Do it now! And don't you make any errors! There you go.

Answer 7

force- 32.17 ft/sec acceleration 9.8m / sec