*The equation for the change in entropy, the system by heat.In SI, entropy is expressed in units of joules per kelvin (J/K).Because the change in entropy is The ice in this drink is slowly melting.*

*The equation for the change in entropy, the system by heat.*In SI, entropy is expressed in units of joules per kelvin (J/K).Because the change in entropy is The ice in this drink is slowly melting.

Sometimes people misunderstand the second law of thermodynamics, thinking that based on this law, it is impossible for entropy to decrease at any particular location.

But, it actually is positive and greater in magnitude.

Consequently, not all energy transferred by heat can be converted into work, and some of it is lost in the form of waste heat—that is, heat that does not go toward doing work.

The unavailability of energy is important in thermodynamics; in fact, the field originated from efforts to convert heat to work, as is done by engines.

In the game of 52 pickup, the prankster tosses an entire deck of playing cards onto the floor, and you get to pick them up.

In the process of picking up the cards, you may have noticed that the amount of work required to restore the cards to an orderly state in the deck is much greater than the amount of work required to toss the cards and create the disorder.

possible to transfer energy by heat from a colder to hotter object.

We'll learn more about this in the next section, covering refrigerators as one of the applications of the laws of thermodynamics.

If temperature changes during the process, then it is usually a good approximation (for small changes in temperature) to take Absolute temperature is the temperature measured in Kelvins.

The Kelvin scale is an absolute temperature scale that is measured in terms of the number of degrees above absolute zero. Using temperatures from another, nonabsolute scale, such as Fahrenheit or Celsius, will give the wrong answer. If so, you have been on the receiving end of a practical joke and, in the process, learned a valuable lesson about the nature of the universe as described by the second law of thermodynamics.

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