ENVS 2030 Lecture Notes - Lecture 8: Lapse Rate, Mechanical Equilibrium, Latent Heat
18 Oct 2017
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Stable: forces will bring it into stable conditions. Unstable: will continue to go on if begun. #of molecules in a volume gives us molecular density. Internal energy stays constant nothing lost or gained: pv/ t = constant, as p falls so does t. Temperature changes 10 degrees celsius every km (dry rate) What happens in a cloud: vapour moves into a liquid state. Latent heat of vaporization = 2. 4 mj/kg lots of energy released raising the temperature of the parcel of air: saturated adiabatic lapse rate now is 6 degrees per km (60% of dry rate) wet/moist lapse rate. Remember: stable if vertical motion starts tends to move back and stop, unstable if vertical motion starts it tends to keep going. Process: compare rising air to surrounding air: warmer than surroundings it will keep rising. If cooler than surrounding it will fall back down. Surroundings: what the actual air temperature is with height.
