Standar conditions for the measurement of gas density is stablished at 0°C and a pressure of 29.92 inches of Mercury wich is the average pressure of the atmosphere at sea level.
There are many types density, like true density, tap density, bulk density etc. Can use analyzer like G-DenPyc 2900 gas pycnometer analyzer to measure them. Aerometer or Hydrometer for density of liquids, Dasymeter for density of gases and Resonant Frequency and Damping Analyser (RFDA) for density of solids.
No, it isn't.
As gases are heated up, its volume increases, resulting in a decrease of density.
The density is a physical characteristic, specific for each material, including gases.
All materials - including gases - have a density !
Gases
Gases, for example
Solids tend to have a higher density because the molecules are arranged closer together where as in gases the molecules are further apart. Since density is Mass/Volume, and solids have more mass per volume than gases it is more dense
Solids have the highest density, followed by liquids and then gases.
atmosphere
you can use a scale for weight, a beaker or measuring cup for liquid, and for gases idk
Because the particles are closer together in a solid then more fit in a set space, making it denser, it's the opposite for gases