Want this question answered?
psychrometer
psychrometer
Relative density, is also called specific gravity, and it is the ratio of the density (mass/volume) of a substance to the density of a particular reference substance, usually water. So, where density has the units of mass/volume, relative density (specific gravity) is unitless.
It is a hygrometer.
The relative density of a substance X, relative to a substance Y isDensity of X/Density of Y= (Mass of X/Volume of X) / (Mass of Y/Volume of Y)If Y is water then the relative density is called the specific gravity.
The instrument that can measure the density of an earthquake is called an seismometer. The first seismoscope dates back to 132 AD.
An instrument used to measure the Specific Gravity (or Relative Density) of a liquid is called as a Hydrometer. It is the Ratio of the density of the liquid to the desnity of the fresh water (i.e. 1.000). The instrument consist of a glass chamber with Lead Shots or Mercury filled at the bottom or the base, to make it float upright.
rd means "relative density".
The term is correctly specific gravity (also relative density) which compares the density (typically in g/cm3) to that of water (which is practically 1 g/cm3).
humidity is moisture in the air and is measured with a hygrometer
VOLUME
you can measure the density of plastic using an instrument called electronic densimeter. this densimeter give you the density measurements very easily and fast. below is few models of this instrument.http://www.worldtesters.com/Tester_Meters/Densimeters.htm