State the law of heat exchange?

Answer 1

There are four laws of thermodynamics Zeroth, First, Second and Third. Zeroth law state that if two systems are in thermal equilibrium with a 3rd system then they are thermal equilibrium with each other. First law is defined by following equation dQ = dU + dW . Second law is based on the conservation of energy. Third law states that as the temperature approaches absolute 0, the entropy of the system approaches a constant min.

Answer 2

There are four laws of thermodynamics, zeroth to third:

Zeroth law. If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

First law. In any process, the total energy of the universe remains the same. This is the law that states that states that energy cannot be created or destroyed.

Second law. The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium. The key words are "isolated" and "system". This law applies for systems that do not exchange energy or information with the outside world. It may not apply for microscopic particles.

Third law. As temperature approaches absolute zero, the entropy of a system approaches a constant minimum.

• The zeroth law of thermodynamics recognizes that if two systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other, thus supporting the notions of temperature and heat.

• The first law of thermodynamics distinguishes between two kinds of physical process, namely energy transfer as work, and energy transfer as heat. It tells how this shows the existence of a mathematical quantity called the internal energy of a system. The internal energy obeys the principle of conservation of energy but work and heat are not defined as separately conserved quantities. Equivalently, the first law of thermodynamics states that perpetual motion machines of the first kind are impossible.

• The second law of thermodynamics distinguishes between reversible and irreversible physical processes. It tells how this shows the existence of a mathematical quantity called the entropy of a system, and thus it expresses the irreversibility of actual physical processes by the statement that the entropy of an isolated macroscopic system never decreases. Equivalently, perpetual motion machines of the second kind are impossible.

• The third law of thermodynamics concerns the entropy of a perfect crystal at absolute zero temperature, and implies that it is impossible to cool a system to exactly absolute zero, or, equivalently, that perpetual motion machines of the third kind are impossible.

Answer 3

There are actually 3 Laws of Thermodynamics (the actual number is debatable, but the number ranges from 3-5, depending on your adding skills). See the link below, wikipedia does an adequate job of explaining it.

Answer 4

The Law of Heat Exchange states that when two substances of different temperatures are placed together, the amount of heat given up by the hot substance is equal to the amount of heat gained by the colder substance.

Answer 5

The law of heat exchange states that heat will always flow from an object at a higher temperature to an object at a lower temperature until thermal equilibrium is reached. This process will continue until both objects are at the same temperature.

Answer 6

The law of heat exchange states that the heat lost by hot materials equals the heat gained by cold materials. This is assuming no heat is lost because of surroundings.

Answer 7

heat exchange is a piece of equipment built for efficient heat transfer from one medium to another.

Answer 8

There are three actually

Conduction

Convection

Radiation