PHYS 1201W Chapter Notes - Chapter 12: Emissivity, Kilogram, Thermal Conduction
Document Summary
Heated substance = volume usually increases in each dimension. Each molecular collision has more energy and more effectively push each other farther. Increased kinetic energy of atoms/molecules apart (material expands) Change in length = (constant a) * original length * change in temperature. Constant a = coefficient of linear expansion. Property of given material, somewhat depends on temperature. Since the change in t is what matters, it can be in c or k. Thermostat = has 2 metal strips with different coefficients of linear expansion attached to each other. When eat, unequal expansion causes strips to bend; helps control heating system. Ultra microtome = apparatus designed to make very thin tissue slices for microscopes. Uses expansion to make slices so small. All dimensions increase when heated: lengths of sides, surface area, volume. Change in area increases twice the rate of linear dimension. Volume increases three times as fast as the length.
