What is the heat flow?
Thermal energy transfer from the hot area to the cold area is known as thermal flow . This occurs when an object or material is at a temperature other than the surrounding objects. The principle of this process is the fact that there must be a thermal balance between objects, also known as the second thermodynamics. Basically, when there is a difference in temperature between materials, the heat flow can be slowed, not stop. In principle, the transfer of thermal energy relies on the diffusion of free electron. To move heat from one object or material to another, adjacent atoms vibrate against each other. This is due to the fact that electrons move from one atom to another. As for liquids, the molecules are further apart, which is why thermal energy is transmitted more slowly when this condition is present.
Convection is also important for thermal flow. The speed of thermal transmission increases with the movementEm faster. There are two different types of convection within the thermodynamics of the thermodynamics: natural and forced. The obtaining forces due to changes in gas or liquid density are naturally occurring, while forced convection is in response to a man -made method such as a pump or fan.
When heat is transmitted from materials through empty space, this concept is known as radiation . This occurs for all objects above the absolute zero, even those found in the perfect vacuum. For example, radiation from the Sun travels a vacuum of space before affecting Earth and other planets.
The general principle of thermodynamics and thermal flow was determined by Sir Isaac Newton. The Cooling Act states that "the degree of heat loss of the body is proportional to the temperatures between the body and its surroundings or the environment." This can be observed by food analysis. For example, when the cake is removed from the oven and placed in a cold window, it isThe rate of heat loss determined by air temperature.
One interesting side of the heat flow can occur when steam turns into a liquid phase. This process, known as condensation, relies on a gas form of liquid replacement. It can be seen in nature in the form of fog or on a cold glass on a hot day.