Heat Flow Meter---Part 2
|
Heat Flow Meter---Part 2 When heat is transferred from materials through an empty space, the concept is known as radiation. This occurs for all objects above absolute zero, even those located within a perfect vacuum. For example, radiation from the Sun travels through the vacuum of space before impacting the earth and other planets. The general principle of thermodynamics and heat flow meter were established by Sir Isaac Newton. The law of cooling states that "the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings, or environment." This can be observed by analyzing food. For example, when a pie is removed from the oven and placed in a cool window, the rate of heat loss is determined by the temperature of the air. One interesting side effect of heat flow meter can occur when vapor changes into its liquid phase. Known as condensation, this process relies on the gaseous form of a liquid changing. This is seen in nature in the form of fog or on a cool glass on a hot day. |
Previous:Heat Flow Meter next:Optical Flow Meter---Part 2