TRG-TRC003-EN 5
period one
Heat and Refrigeration
notes substance. This is commonly referred to as the principle of “conservation of
energy.”
Ice cubes are typically placed in a beverage to cool it before it is served. As heat
is transferred from the beverage to the ice, the temperature of the beverage is
lowered. The heat removed from the beverage is not destroyed but instead is
absorbed by the ice, changing the ice from a solid to a liquid.
The second principle is that heat naturally flows from a higher temperature
substance to a lower temperature substance; in other words, from hot to cold.
Heat cannot flow from a cold substance to a hot substance.
Consider the example of the beverage and the ice cubes. As long as the
temperature of the beverage is higher than the temperature of the ice cubes,
heat will always flow from the beverage to the ice cubes.
+HDW)ORZVIURP+RWWR&ROG
Figure 10