Radon gas may or may not be used to predict an earthquake. Scientists in Chile and Italy sometimes find increased levels of radon gas in wells 6-24 hours before an earthquake. The increase is due to tiny escape routes that form during the crustal [or lithospheric or tectonic] plate activities that lead to earthquakes. Specifically, an example of a successful prediction based on radon gas levels is the warning by Gran Sasso laboratory researcher Giampaolo Giuliani of the April 7, 2009 in the region of Abruzzo.
radon
Radon is the gas that can [or cannot!] be used to predict earthquakes. Its levels noticeably may rise in basements and wells. That's because of the air and water escape routes that may form in soil 6-24 hours before an earthquake.
Henry's law states that the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid. This relationship allows us to predict how much gas will dissolve in a liquid at a specific pressure. At higher pressures, more gas will dissolve in the liquid according to Henry's law.
Radon (Rn)
Liquid
A barometer is used to measure atmospheric pressure, which can help predict changes in weather conditions. A volumeter is used to measure the volume of a substance, such as a liquid or gas, in a given space or container.
In order to try to predict a volcanic eruption, scientists monitor the distribution of earthquakes near the volcano, the quantity, temperature, and composition of gas emissions, and look for deformation of the volcano itself. All of these can be used to determine if magma is moving underground, how close it is to the surface, and even how obstructed it is.
Formaldehyde is liquid at room temperature.
Whe the propelant gas is released from the can the equilibrium gas-liquid is disrupted and more liquid is evaporated.
Radon gas may or may not be used to predict an earthquake. Scientists in Chile and Italy sometimes find increased levels of radon gas in wells 6-24 hours before an earthquake. The increase is due to tiny escape routes that form during the crustal [or lithospheric or tectonic] plate activities that lead to earthquakes. Specifically, an example of a successful prediction based on radon gas levels is the warning by Gran Sasso laboratory researcher Giampaolo Giuliani of the April 7, 2009 in the region of Abruzzo.
Liquid Petroleum Gas (LPG) and natural gas Methane (CH4).
Generally gaseous/æreiform, however liquid oxygen is ALSO a thing. The latter was used in the first liquid fuel rocket by Robert Goddard.