The person may be drinking too much fluid or have a condition that makes them thirsty.Ĭonditions that cause low specific gravity include: Low specific gravity suggests that urine is too diluted. Learn more about red blood cells in the urine here. High levels of certain substances in the urine can also cause high specific gravity. diarrhea or vomiting resulting in dehydration.This can be a sign of dehydration, and the doctor may recommend drinking more clear fluids.Ĭonditions that cause high specific gravity include: High specific gravity suggests that the concentration of urine is too high. Results from these other tests will help make an accurate diagnosis. If a doctor identifies an unusual result, they may recommend further testing to determine if an underlying condition is causing the urine changes. Urine-specific gravity is only one measure of health. However, doctors cannot specify low, acceptable, or high values because many factors can affect urine composition. The soil sample taken for testing have to be completely oven dried.Doctors consider the result of a urine-specific gravity test to be normal if it is within the range 1.003–1.030.The weighing balance has to be checked before conducting the test. Entrapped air have to be eliminated completely before testing the sample. Two main reasons for error in the calculation are weighing inaccuracies and the presence of entrapped air.If present, they have to be broken down into the original form. The soil sample to be tested for specific gravity must be completely free from lumps.A specific gravity value greater than 3 will be shown by soils that have heavy substances. If the soils consist of porous and organic materials, a specific gravity value of less than 2 will be obtained. The specific gravity of soil particles will come within the range of 2.65 and 2.85. Unless specified, the specific gravity values of the soil will be reported at 27-degree Celsius. Table.1: Observations and Calculations for Specific Gravity of Soil Sl. M 4 = mass of Pycnometer filled with water only. M 3= mass of the Pycnometer and soil and water, M 2= mass of the Pycnometer with dry soil The specific gravity of soil is determined using the relation: Take its mass (M 4).įig.2: Specific Gravity of Soil By Pycnometer Method Observations and Calculations for Specific Gravity of Soil Fill the Pycnometer with water completely upto the mark. Reapply the vacuum for about 5min till air bubbles stop appearing on the surface of the water.ħ. Fill the Pycnometer with water, about three-fourths full. Connect the Pycnometer to a vacuum pump to remove the entrapped air, for about 20 minutes for fine-grained soils and about 10 minutes for coarse-grained soils.Ħ. Unscrew the cap and add sufficient amount of de-aired water to the Pycnometer so as to cover the soil. Unscrew the cap and place about 200 g of oven dried soil in the Pycnometer. Mark the cap and Pycnometer with a vertical line parallel to the axis of the Pycnometer to ensure that the cap is screwed to the same mark each time.ģ. Take its mass (M 1) to the nearest of 0.1 g.Ģ. Procedure for Specific Gravity of Soil by Pycnometer Methodġ. Weighing balance, with an accuracy of 1g.Mentioned below are the equipment and apparatus required to conduct the test for specific gravity of soil by pycnometer method. While closing the jar, it is screwed till the mark so that the volume of the pycnometer will remain constant throughout the calculation. The leakage is prevented by having a washer between the cap and the jar. There is a small hole at its apex of 6mm diameter.
0 Comments
Leave a Reply. |