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- The specific weight is the weight of a known volume of material at a given temperature and pressure; the unit of measure is kN/m3.

- But if you think to relative density:

Relative density (specific gravity) is the ratio between the density of the material to be tested and the density of water, at a given temperature and pressure; consequently no unit of measure for this ratio.

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12y ago

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Which physical quantities does not have units?

specific gravity


What is the specific gravity and its unit?

Specific gravity doesn't have units. It's the density relative to water, so specific gravity is effectively just a number.


How would you convert specific gravity into gallons?

These are incompatible units


How to Find Volume when given mass and specific gravity?

To find the volume of a substance when given its mass and specific gravity, divide the mass by the product of the specific gravity and the density of water (1000 kg/m^3). The formula is: Volume = Mass / (Specific Gravity * Density of Water).


Why does specific gravity not have a unit?

Specific Gravity is a unitless number because it is the ratio between the density of the material of interest and a standard material (e.g. water). The units cancel out leaving a numerical value only.


Why is it convienient to express the density or the specific gravity in cgs units?

Actually it isn't. cgs units are sort of obsolete; nowadays, the scientific community uses SI units.


What are the units of measuring density?

density = mass/volume. The unit of density is kg/m3


Which of these physical quantities does not have any units specific gravity resistance distance inertia?

what is the smallest prime number


What is specific gravity of petrol with unit?

737.22 - see http://www.simetric.co.uk/si_liquids.htm The sp. gravity of the petrol(vehicle) is 0.73722 and that of natural petrol is 0,71122 Note that specific gravity has no units.


What is the relationship between the density of a substance and its specific gravity?

The specific gravity of a substance is the ratio of its density to the density of a reference substance (usually water). Specific gravity is a dimensionless quantity that allows us to compare the density of different substances without units.


What are some examples of physical quantities that do not have units?

This often happens if you take the ratio of two quantities. In that case, the units disappear. For example:* A coefficient of friction, defined as the ratio between two forces * The specific gravity, defined as a ratio between two densities


What is specific gravity and its unit?

Specific gravity is a unitless measure that compares the density of a substance to the density of a reference material (usually water at 4 degrees Celsius). It indicates how many times denser or lighter a substance is compared to water. The specific gravity of water is 1.