The capacity of the bulb is nearly 250 ml. below is made of thin glass having a bulb at the bottom.
#Purpose for a specific gravity lab free
Weighing balance Le Chatelier specific gravity flask withĪ ground glass stopper, Specific gravity bottle Kerosene free from water Constant temperature This method is also similar to the pycnometer method as discussed above.Also read: Laboratory Tests On Cement | 8 Different Types Of Cement Test In this method a glass jar of about 1 liter capacity is used. The method is suitable for fine grained and medium grained soils. About 80-100g of oven dry soil is required in this case. The method is similar to the density bottle method. It is fitted with an adaptor for connecting it to a vacuum line for removing entrapped air. Measuring flask is of 250 ml (or 500 ml) capacity, with a graduation mark at that level. M 4= mass of pycnometer filled with water only The specific gravity of solids, G is determined using following equation: The method can be used for all types of soils, but is more suitable for medium grained soils with more than 90% passing a 20 mm IS sieve and for coarse grained soils with more than 90% passing a 40 mm IS sieve. As the capacity of the pycnometer is larger, about 200-300g of oven dry soil is required for the test. This method is similar to the density bottle method which is discussed as above. However the method can also be used for medium and coarse grained soils if they are pulverized such that the particles can pass through 2mm IS sieve. Sometimes, other liquids, such as paraffin, alcohol and benzene are also used.Density bottle method is suitable for fine grained soils with more than 90% passing 2mm IS sieve. If G k is the specific gravity of kerosene at the test temperature, the equation will be Kerosene is a better wetting agent than water and is sometimes used in place of water. If mass of solids M s is subtracted from M 3 and replaced by the mass of water equal to the volume of solid, the mass M 4 is obtained. The temperature should be same as before. The mass of the bottle filled with water is taken. The bottle must be filled to the same mark as in the previous case. The bottle is emptied, washed and then refilled with distilled water. The stopper is inserted in the bottle and its mass is taken.
More water is added to the bottle to make it full.
Alternatively, the entrapped air can be removed by gentle heating. Air entrapped in the soil is expelled by applying a vacuum pressure of about 55cm of mercury for about one hour in a vacuum desiccator. More water is added until the bottle is half full. The soil is allowed to soak water for about 2 hours. If the sample contains particle of larger size, it shall be ground to pass a 2-mm sieve before the test.ĭistilled water is then added to cover the sample. About 5-10g of oven dried sample soil is taken in the bottle and weighed. The mass of the bottle, including that of stopper is taken. The density bottle is cleaned and dried at a temperature of 105 to 110 degree celsius and cooled. The density bottle of 50 ml capacity is generally used. The specific gravity of solid particles can be determined in a laboratory using a density bottle fitted with a stopper having a hole. The specific gravity of solid particles can be determined in the laboratory using the following methods: Keywords: Pycnometer, specific gravity, density, density bottle, glass jar, dry soil.
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