ATOC 181 Lecture Notes - Lecture 4: Cool Air, Thermal Conductivity, Calorie

• School: McGill University
• Department: Atmospheric & Oceanic Sciences
• Course: ATOC 181
• Professor: Parisa Ariya

Document Summary

Radiation and the global energy balance (in part b) Energy: capacity to do work on some object/fluid: work = when force pushes/pulls/lifts matter. o o. Internal combustion engine = chemical e converted to mechanical work. Lifting brick = exert force to oppose gravity and raise object: unit of energy = joules = 1(kg m^2 s^-2) Kinetic energy (ke): energy of a moving object (half of mass x velocity squared). o. Ke = 1/2m x v^2: m = mass measured in (kg, v = velocity in meters/second. Gravitation potential energy (pe): the potential for doing work. o. Pe = m. g. h: g = gravitational acceleration (m/s^2, h = height above some reference level (m) Collective microscopic kinetic + potential energy of molecules in a substnace. E associated w/ electromagnetic (em) waves (photons); emitted by all bodies at temperatures above 0k. o. Heat added = work done + internal e gained. Heating = balanced by work/increase in internal e.