# How do we calculate the specific gravity of soils?

Now that you have the density of soil solids, you can calculate the specific gravity of soil solids (SG). To find it, divide the density of soil solids by the density of water (Pw), which is 1,000 kg/m3. The calculation should then be: SG = Ps/Pw.

The specific gravity of soil is defined as the unit weight of the soil mass divided by the unit weight of distilled water at 4°C. It is some times required to compare the density of the soil solids to the density of water. This comparison is in the form of ratio and is termed as the specific gravity of the soil.

One may also ask, how does a pycnometer measure specific gravity? Determine and record the weight of the pycnometer containing the dry soil, WPS. (3) Add distilled water to fill about half to three-fourth of the pycnometer. Soak the sample for 10 minutes. (4) Apply a partial vacuum to the contents for 10 minutes longer, to remove the entrapped air.

Also, why specific gravity of soil is determined?

The knowledge of specific gravity is needed in calculation of soil properties like void ratio, degree of saturation etc. Specific gravity G is defined as the ratio of the weight of an equal volume of distilled water at that temperature both weights taken in air.

How do you measure specific gravity?

The specific gravity, then, may be determined by dividing the weight of a substance in grams by its volume in c.c.; but it is more convenient in practice to determine it by dividing the weight of the substance by the weight of an equal volume of water.

### What is specific gravity in soil?

The knowledge of specific gravity is required in calculation of soil properties like void ratio, degree of saturation and also weight-volume relationship. Definition: Specific gravity G is defined as the ratio of the unit weight ( or density ) of soil solids only to unit weight (or density ) of water.

### What is the application of specific gravity?

Specific gravity:- It is used to define the weight or density of a liquid as compared to the density of an equal volume of water at a specified temperature. The temperature used for measurement is usually 39.2o F (4o C), because this temperature allows water to assume its maximum density.

### How does temperature affect specific gravity?

The specific gravity of a substance x, at a temperature T is the density of x at T relative to the density of water at 4 degC. Since the density of x changes with temperature, the specific gravity of x will change with temperature. Measurement of specific gravity is a quick way to measure the density of a liquid.

0.97 to 1.02

### Why is the specific gravity important?

4.1 Specific gravity is an important property of fluids being related to density and viscosity. Knowing the specific gravity will allow determination of a fluid’s characteristics compared to a standard, usually water, at a specified temperature.

### What is the unit weight of water?

In the metric, or SI, system the unit weight of water is 998 kg per cubic meter — kg/m3 — or approximately 1 g per cubic centimeter, g/cm3. In imperial measurements, the unit weight of water is commonly given as 62.4 pounds per cubic foot, lbs/ft3.

### What is the density of soil?

The weight per unit volume of the solid portion of soil is called particle density. Generally particle density of normal soils is 2.65 grams per cubic centimeter.

### What is specific gravity of cement?

The specific gravity is normally defined as the ratio between the weight of a given volume of material and weight of an equal volume of water. The portland cement have a specific gravity of value around 3.15. To determine the specific gravity of cement, kerosene which does not recent with cement is used.

### What is a specific gravity bottle?

(engineering) A small bottle or flask used to measure the specific gravities of liquids; the bottle is weighed when it is filled with the liquid whose specific gravity is to be determined, when filled with a reference liquid, and when empty. Also known as density bottle; relative-density bottle.

### How do you measure specific gravity of a liquid?

Method 1 Measuring Specific Gravity with a Hydrometer Pour a sample of your liquid into a container. Check that your liquid is the correct temperature. Place the hydrometer in the liquid. Read the specific gravity from the hydrometer.

### What is specific gravity equal to?

Specific gravity, also called relative density, is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.

hydrometer

### What is a specific gravity test?

Reference Range. Urinary specific gravity (SG) is a measure of the concentration of solutes in the urine. It measures the ratio of urine density compared with water density and provides information on the kidney’s ability to concentrate urine. A urinary specific gravity measurement is a routine part of urinalysis.

### What is specific gravity of water?

It is common to use the density of water at 4degC (39degF) as a reference since water at this point has its highest density of 1000 kg/m3 or 1.940 slugs/ft3. In that case specific gravity of Water is 1.