Q.

State the third law of thermodynamics ?

Asked by azam khan,
17 Oct '12 10:42 am

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Answers (6)

1.

The third law of thermodynamics is sometimes stated as follows:

The entropy of a perfect crystal at absolute zero is exactly equal to zero.

At zero kelvin the system must be in a state with the minimum possible energy, and this statement of the third law holds true if the perfect crystal has only one minimum energy state. Entropy is related to the number of possible microstates, and with only one microstate available at zero kelvin, the entropy is exactly zero.

A more general form of the third law applies to systems such as glasses that may have more than one minimum energy state:

Answered by LIPSIKA, 17 Oct '12 11:16 am
The entropy of a perfect crystal at absolute zero is exactly equal to zero.

At zero kelvin the system must be in a state with the minimum possible energy, and this statement of the third law holds true if the perfect crystal has only one minimum energy state. Entropy is related to the number of possible microstates, and with only one microstate available at zero kelvin, the entropy is exactly zero.

A more general form of the third law applies to systems such as glasses that may have more than one minimum energy state:

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2.

The Third Law of Thermodynamics refers to a state known as 'absolute zero.' This is the bottom point on the Kelvin temperature scale. The Kelvin scale is absolute, meaning 0degree Kelvin is mathematically the lowest possible temperature in the universe. This corresponds to about -273.15degree Celsius, or -459.7 Fahrenheit.... The Third Law of Thermodynamics can be visualized by thinking about water. Water in gas form has molecules that can move around very freely. Water vapor has very high entropy (randomness). As the gas cools, it becomes liquid. The liquid water molecules can still move around, but not as freely. They have lost some entropy. When the water cools further, it becomes solid ice. The solid water molecules can no longer move freely, but can only vibrate within the ice crystals. The entropy is now very low. As the water is cooled more, closer and closer to absolute zero, the vibration of the molecules diminishes. If the solid water reached absolute zero, all molecular moti
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Answered by aflatoon, 17 Oct '12 11:04 am
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3.

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4.

The third law of thermodynamics is sometimes stated as follows:

The entropy of a perfect crystal at absolute zero is exactly equal to zero.

Answered by iqbal seth, 17 Oct '12 10:46 am
The entropy of a perfect crystal at absolute zero is exactly equal to zero.

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5.

The entropy of a system approaches a constant value as the temperature approaches zero. The entropy of a system at absolute zero is typically zero, and in all cases is determined only by the number of different ground states it has. Specifically, the entropy of a pure crystalline substance at absolute zero temperature is zero.

Answered by Rose, 17 Oct '12 10:44 am
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6.

It is impossible to cool a system all the way to exactly absolute zero.

Answered by Red label, 17 Oct '12 10:44 am
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