What is a relative density test?
Relative density or density index is the ratio of the difference between the void ratios of a cohesionless soil in its loosest state and existing natural state to the difference between its void ratio in the loosest and densest states.
What is relative density defined as?
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material (i.e., water). It is usually measured at room temperature (20 Celcius degrees) and standard atmosphere (101.325kPa). It is unitless.
What is relative density of human body?
The relative density of the material of the body is the ratio of its weight in air and to the apparent loss of its weight in water. By using a spring balance, the weight of the body measured in air is (5.00±0.05)N. . The weight of the body measured in water is found to be (4.00±0.05)N. .
What is relative density of soil?
Relative density is defined as the ratio of difference of void ratios of cohesionless soil in its loosest state and the natural state (emax – e) to the difference between void ratio in its loosest and densest state (emax – emin). Relative density determines the compactness of the cohesionless soil.
What do you need to test relative density?
Hydrometer. The relative density of a liquid can be measured using a hydrometer. This consists of a bulb attached to a stalk of constant cross-sectional area, as shown in the adjacent diagram.
Why relative density is important?
Relative density tells us how heavy the substance is in comparison to water.It helps us to determine the density of an unknown substance by knowing the density of a known substance.It is very important in the accurate determination of density.
What is relative density example?
For example, an ice cube, with a relative density of about 0.91, will float. A substance with a relative density greater than 1 will sink….Relative density.
| Specific gravity | |
|---|---|
| Common symbols | SG |
| SI unit | Unitless |
| Derivations from other quantities |
What is the significance of relative density?
What is the use of relative density?
Uses. Relative density can also help to quantify the buoyancy of a substance in a fluid or gas, or determine the density of an unknown substance from the known density of another. Relative density is often used by geologists and mineralogists to help determine the mineral content of a rock or other sample.
How do you find relative density?
Relative density can be calculated directly by measuring the density of a sample and dividing it by the (known) density of the reference substance. The density of the sample is simply its mass divided by its volume.
What instrument measures relative density?
hydrometer
hydrometer, device for measuring some characteristics of a liquid, such as its density (weight per unit volume) or specific gravity (weight per unit volume compared with water).
What are the applications of relative density?
Following are the uses of relative density:
- It is used for determining the density of unknown substance from the known density of another substance.
- It is used by geologist to find out the mineral content into the rock.
- Testing purity of a substance (example gold).
Which is an example of a relative density?
Relative density of a substance is the ratio of the density of substance to the density of water. Or. Relative density of a substance is the ratio of mass of any volume of substance to the mass of an equal volume of water. Example 1. A globe of steel has a mass of 12g and a volume of 15.2cm³,find its relative density.
How is the relative density of soil determined?
The relative density of natural or compacted soil can be determined by obtaining the minimum and maximum density of soil in the laboratory and the in-situ density of soil in the field. The test is applicable for freely draining cohesionless soils only.
How is the relative density of water determined?
The relative density of solids or liquids is the ratio between the mass of a volume of a substance to be examined, determined at 20°C, and the mass of the same volume of water, determined at 4°C. The relative density has no dimension.
Which is better relative density or void ratio?
Relative density, therefore, gives a better indication of the strength and deformation of soil than its void ratio or density. Two sands having same relative density would show similar behavior under loads, although their void ratios may be different.