ENVIRSC 1A03 Lecture Notes - Lecture 6: Dew Point, Heat Index, Fluid Parcel

• School: McMaster University
• Department: Environmental Science
• Course: ENVIRSC 1A03
• Professor: Luc Bernier

Document Summary

Latent heat is being transferred from one area to another. (through absorption and releasing) Sh (specific humidity) is the actual quantity of water vapour in air: sh = mass of water vapour (g) / mass of total air (kg) Saturation specific humidity is the maximum amount of h2ov (i. e. sh) that an air parcel can contain at any given time: dependent on temperature, exponential increase in saturation specific humidity as temperature increases. Saturation is the change of phase once limit is reached: density of gas cannot be increased above a certain level (saturation, establishes equilibrium with the rates of evaporation and condensation when it reaches saturation. Relative humidity (rh) is the h2ov in air compared to the maximum at that temperature: rh = 100(sh/saturation sh, rh falls when temperatures increases and sh stays the same. Heat index is based on the temperature and the moisture content (based off the feel )