# Why Did the Water's Temperature Increase Without Adding Heat?

• Benzoate
In summary, the conversation is about a cup of water on a dining room table that was measured to be 20 degrees Celsius and then 25 degrees Celsius after 10 minutes. The question asks what can be concluded about the amount of heat added to the water, but it turns out to be a trick question since no heat was actually added. This is because heat is a spontaneous process and in this case, the temperature increased rather than decreased. The possible explanation for this could be that the ice in the cup has melted.
Benzoate

## Homework Statement

A cup containing 200 grams of H20 is siting on your dining room table . After carefully measuring its temperature to be 20 degree celsuis , y ou leave the room. Returning ten minutes later, you meaure its temperature again and find that it is now 25 degree celsuis. What can you conclude about the amount of heat added to water?(hint: this is a trick question)

## The Attempt at a Solution

My response to this question was that there is no heat added or heat is equal to zero since heat is a spontaneous process where heat flows from a hot object to a cold object. Even though there is a temperature difference involved in this process, The temperature increases rather than decreases.

Ah, this is interesting...

I making a wild guess here.

Is it because ice (also H2O) in cup has melted?

If not, the question setter will say "200 g of water" instead of "200 g of H2O"

Hehe...

This suggests that the cup of water could have been placed in a warmer environment, causing the temperature to increase. Without further information about the surroundings and any external factors, it is impossible to determine the exact amount of heat added to the water.

## 1. What is thermal physics?

Thermal physics is the study of how heat and temperature affect matter and energy. It focuses on the microscopic behavior of particles and their interactions in relation to thermal energy.

## 2. What is work in relation to thermal physics?

In thermal physics, work is the transfer of energy from one object to another due to mechanical motion or forces. It can also refer to the energy transfer that occurs during changes in volume or pressure in a thermodynamic system.

## 3. How is heat defined in thermal physics?

Heat is a form of energy that is transferred between two objects at different temperatures. It flows from the hotter object to the colder object until they reach thermal equilibrium, or the same temperature.

## 4. What is the difference between heat and temperature?

Heat and temperature are often used interchangeably, but they have different meanings in thermal physics. Temperature is a measure of the average kinetic energy of particles in a substance, while heat is the energy that is transferred between two objects due to a temperature difference.

## 5. How does thermal physics relate to everyday life?

Thermal physics plays a crucial role in our daily lives, from the temperature regulation in our homes and buildings to the functioning of electronic devices. It also helps us understand various natural phenomena, such as weather patterns and the transfer of energy in biological systems.

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