The straight dotted lines show the adiabatic decrease of temperature for ascending dry air.
This is the line of no transmission of heat, therefore known as adiabatic.
This is the ratio of the adiabatic elasticity of air to the isothermal elasticity.
But let us assume that we have a compressor which shows an adiabatic pressure line.
Above that height the air suddenly becomes warmer, and then cools with ascent at a rate somewhat less than the adiabatic rate.
The adiabatic lines, representing a fall of temperature of 1° Fahrenheit per 183 feet of ascent, serve for comparison.
The temperature falls at the adiabatic rate in unsaturated air till the base of the cumulus cloud is reached.
Higher than this, the temperature decreases at a fairly uniform rate, but more slowly than the adiabatic rate.
At the same time the utmost pains are taken to maintain the adiabatic condition of the metal walls.
adiabatic, ad-i-a-bat′ik, adj. (physics) neither losing nor gaining heat: impassable to heat.
Occurring without gain or loss of heat. When a gas is compressed under adiabatic conditions, its pressure increases and its temperature rises without the gain or loss of any heat. Conversely, when a gas expands under adiabatic conditions, its pressure and temperature both decrease without the gain or loss of heat. The adiabatic cooling of air as it rises in the atmosphere is the main cause of cloud formation.