How do you perform a hydrometer analysis of soil?
By measuring the volume of water displaced. Fill a 1000-cc graduate with water to approximately 700 cc. Observe and record the reading of the water level. Insert the hydrometer and again observe and record the reading.
How do you test a hydrometer?
The liquid to test is poured into a tall container, often a graduated cylinder, and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer correlates to relative density.
What is hydrometer test for soil?
The hydrometer analysis of soil, based on Stokes’ law, calculates the size of soil particles from the speed at which they settle out of suspension from a liquid. Results from the test show the grain size distribution for soils finer than the No. 200 (75µm) sieve.
What is a hydrometer used for in a soils laboratory?
By measuring suspended solids in sedimentation cylinders, hydrometers are able to measure a soil’s particle-size distribution. To perform a hydrometer analysis the test specimen is combined with a dispersing agent and test water. A hydrometer is then used to take readings at specific time intervals.
What is the use of hydrometer test?
Hydrometer test is carried out to quantitatively determine the Particle/Grain Size Distribution for soil particles of size smaller than 75 micron. Calibrated at 27°C, range of 0.995 to 1.030 g/cc, graduation lines at interval of 0.0005; in conformity with IS-3104: 1965.
What is the principle of hydrometer?
A hydrometer is an instrument used to determine specific gravity. It operates based on the Archimedes principle that a solid body displaces its own weight within a liquid in which it floats. Hydrometers can be divided into two general classes: liquids heavier than water and liquids lighter than water.
Why do we do hydrometer test?
Hydrometer method is used to determine the particle size distribution of fine-grained soils passing 75 µ sieve. The hydrometer measures the specific gravity of the soil suspension at the center of its bulb. The specific gravity depends upon the mass of solids present, which in turn depends upon the particle size.
What are the different types of hydrometers?
Note that the three main types of hydrometers available on the market are triple scale hydrometer, thermohydrometers, and precision hydrometers.
What is a hydrometer used for?
A hydrometer is an instrument used to determine specific gravity. It operates based on the Archimedes principle that a solid body displaces its own weight within a liquid in which it floats. Hydrometers can be divided into two general classes: liquids heavier than water and liquids lighter than water..
What is the purpose of dispersing the soil in the hydrometer method?
In the hydrometer analysis, dispersing agents are used to disperse the fine-grained particles of the soil in the suspension medium (water).
How is hydrometer used?
What is hygrometer used to measure?
hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.
How is the hydrometer used in soil analysis?
The hydrometer analysis is a widely used method of obtaining an estimate of the distribution of soil particle sizes from the #200 (0.075 mm) sieve to around 0.001 mm. The data are plotted on a semi-log plot of percent finer versus grain diameters to represent the particle size distribution.
Why do you need a hydrometer for sieve analysis?
Both sieve analysis and hydrometer analysis are required to obtain the complete gradation curve of the coarse and fine fraction of many natural soils. Hydrometer analysis is essential for obtaining the complete particle size distribution of such soils.
How are particle size distributions used in hydrometer analysis?
Particle size distribution obtained from sieve analysis may be combined with the data from a hydrometer analysis to produce a complete gradation curve. It is possible to approximate the percentage of silt and clay particles present in the finer portion from the hydrometer analysis.
What should be included in a hydrometer report?
Your report should include the following: Analysis of the test results – Complete the table provided and show one sample calculation. Draw the grain size distribution curve for the data from the hydrometer analysis only and the combined grain-size distribution curve.