# Pouring water and Temperature

• ThunderDigger
In summary, the temperature of water can greatly affect its pouring ability and taste. Warmer water pours more easily and may be perceived as more refreshing, while colder water may be perceived as more soothing. The ideal temperature for brewing tea or coffee varies and can impact the taste of the final product. Additionally, the temperature of the water can also affect its boiling time, with warmer water boiling faster. Pouring hot water into a cold glass can cause it to break due to thermal shock, so it is important to take precautions when handling hot liquids and glassware.

## Homework Statement

a friend of mine came to me with a physics question and I was embarrassed to not have an answer for him!

Water is being poured into a container from height h. What is the change in temperature of the water? I don't even know what direction to look so any help would be appreciated. Thanks.

Hint: Consider the change in mechanical energy of the water. What happens to that energy?

I can understand your embarrassment for not having an answer to your friend's question. However, the change in temperature of water when poured into a container from a certain height is not a simple answer. It depends on various factors such as the initial temperature of the water, the container material, the height from which the water is being poured, and the surrounding temperature.

To understand the change in temperature, we need to consider the concept of potential and kinetic energy. When water is poured from a height, it gains kinetic energy due to its motion. This kinetic energy is converted into thermal energy when the water hits the bottom of the container. This increase in thermal energy may result in a slight increase in temperature.

Additionally, the material of the container also plays a role in the change in temperature. If the container is made of a material that can absorb heat well, such as metal, it may result in a larger increase in temperature compared to a container made of a material that does not absorb heat as well.

The initial temperature of the water also plays a significant role. If the initial temperature is higher, the change in temperature may not be as noticeable compared to if the initial temperature is lower.

In conclusion, the change in temperature of water when poured into a container from a certain height is not a straightforward answer and depends on various factors. It would be helpful to know more details about the specific scenario to provide a more accurate answer. I hope this explanation helps you understand the complexity of this question.

## 1. How does the temperature affect the pouring of water?

The temperature of water can affect its viscosity, or thickness, which can impact how easily it pours. Warmer water has lower viscosity and therefore pours more easily than colder water. Additionally, the temperature of the container can also affect how quickly the water cools down, which may also impact its pouring ability.

## 2. Does the temperature of the water affect its taste?

Yes, the temperature of water can affect its taste. Cold water may be perceived as more refreshing, while warm water may be perceived as more soothing. Additionally, certain compounds in water, such as chlorine, may be more noticeable at different temperatures, which can also impact taste.

## 3. Is there an ideal temperature to pour hot water for making tea or coffee?

The ideal temperature for brewing tea or coffee can vary depending on personal preference and the type of tea or coffee being used. Generally, water that is too hot can burn the leaves or grounds, resulting in a bitter taste, while water that is too cool may not extract enough flavor. A common range for brewing tea is between 160-212°F (71-100°C), while coffee is typically brewed between 195-205°F (91-96°C).

## 4. Does the temperature of the water affect its boiling time?

Yes, the temperature of water can affect its boiling time. Warmer water will typically boil faster than colder water due to the increased energy and movement of particles. However, factors such as altitude, pressure, and impurities in the water can also impact boiling time.

## 5. Can pouring hot water into a cold glass cause it to break?

Yes, pouring hot water into a cold glass can cause it to break. This is due to thermal shock, where the sudden change in temperature causes stress on the glass, leading it to crack or shatter. It is important to preheat glassware or use tempered glass when pouring hot liquids to prevent this from happening.