Explain what a heat engine does and what a heat mover does.

Define Heat Engine: A heat engine is a device that converts heat energy into mechanical work. The heat engine operates in a cycle, where it takes in heat from a high-temperature source, converts a part of that heat into work, and finally, releases some of the heat into a lower-temperature sink. The work extracted from a heat engine is often used to perform tasks or drive machinery. Some common examples of heat engines include steam engines, internal combustion engines, and Stirling engines. Define Heat Mover: A heat mover, also known as a heat pump or refrigerator, is a device that transfers heat from a low-temperature source to a high-temperature sink, utilizing external work. The heat mover accomplishes this task by applying a work source to force heat to move against its natural tendency (from high temperatures to low temperatures). The primary purpose of heat movers is to cool or refrigerate objects (in the case of refrigerators) or to heat buildings (in the case of heat pumps). Comparison between Heat Engine and Heat Mover: The main differences between heat engines and heat movers are as follows: 1. Heat engines convert heat energy into mechanical work, while heat movers transfer heat from a low-temperature source to a high-temperature sink using external work. 2. Heat engines operate in a cycle, whereas heat movers usually work continuously. 3. Heat engines take heat from a high-temperature source and release it to a low-temperature sink, while heat movers work in the opposite way, transferring heat from a low-temperature source to a high-temperature sink. 4. Heat engines are commonly used in power generation and transportation, while heat movers are typically found in refrigeration and heating applications. By understanding the roles heat engines and heat movers play in the transfer and conversion of heat energy, we can appreciate their fundamental differences and their practical uses in various applications.