Materials can feel hot or cold but be at the same temperature, room temperature, if have been in the same room for a long time without a heat source or sink
Heat and temperature are different ideas
Materials conduct heat energy at different rates
Conductors: materials with high thermal conductivity (metals)
Insulators: materials with low thermal conductivity (Styrofoam, plastic)
Property of thermal conductivity is NOT related to property of density
Heat flows from hot to cold materials
If mix equal amounts of hot and cold water, equilibrium temperature is half way between initial hot and initial cold temperatures
If mix unequal amounts of hot and cold water, equilibrium temperature will be closer to the initial temperature of the larger amount of water.
Conservation of energy: heat lost = heat gained
Heat lost by hot water = heat gained by cold water (and the environment)
Amount of heat lost or gained depends on how much stuff you have (mass), what kind of stuff it is (c, specific heat), how much the temperature changed ( ∆t): (mc ∆t). If Heat lost by hot water = heat gained by cold water