According to the second law, heat flows?

According to the second law, heat flows?

• A. From lower to higher temperature
• B. In all cases, heat flows in both directions
• C. From high temperature objects to low temperature objects
• D. It depends on pressure

Answer: (C)

The main idea here is that heat transfer follows a temperature gradient. When two objects are at different temperatures, the hotter one has higher average molecular energy. When they come into contact, energy flows from the hotter object to the cooler one until they reach the same temperature. This spontaneous flow from hot to cold is what the second law describes in everyday terms, and it also aligns with increasing overall entropy. It’s important to note that moving heat from cold to hot isn’t something that happens on its own; it requires input of work or a device such as a refrigerator or heat pump. Pressure doesn’t dictate the direction of heat flow in general, though it can influence other properties of the system. So the natural, everyday direction of heat flow is from higher temperature objects to lower temperature objects.

The main idea here is that heat transfer follows a temperature gradient. When two objects are at different temperatures, the hotter one has higher average molecular energy. When they come into contact, energy flows from the hotter object to the cooler one until they reach the same temperature. This spontaneous flow from hot to cold is what the second law describes in everyday terms, and it also aligns with increasing overall entropy.

It’s important to note that moving heat from cold to hot isn’t something that happens on its own; it requires input of work or a device such as a refrigerator or heat pump. Pressure doesn’t dictate the direction of heat flow in general, though it can influence other properties of the system. So the natural, everyday direction of heat flow is from higher temperature objects to lower temperature objects.