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Identify the instance when blowing air from the mouth helps to cool things up ?
- a)Blowing over hands on a cold day
- b)Blowing over leaves fallen on ground
- c)Blowing over coffee
- d)Blowing over sharpener fillings
Correct answer is option 'C'. Can you explain this answer?
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Identify the instance when blowing air from the mouth helps to cool th...
Understanding Cooling by Blowing Air
When we blow air from our mouths, it can help cool certain objects or surfaces through the process of evaporation and convection. Let’s explore why blowing over coffee is the correct instance where this phenomenon occurs.
1. Evaporation Process
- When you blow air over hot coffee, the airflow helps to increase the rate of evaporation.
- Evaporation occurs when the molecules at the surface of the liquid gain enough energy to escape into the air as vapor.
- The faster the evaporation, the more heat is absorbed from the liquid, leading to cooling.
2. Increased Surface Area
- Blowing air creates movement, which increases the surface area of the coffee exposed to the air.
- This further accelerates the evaporation process, resulting in a more significant temperature drop.
3. Convection Effect
- The blowing air can carry away the warm, moist air that sits above the coffee.
- Replacing it with cooler air enhances the cooling effect, as the overall temperature of the liquid decreases.
4. Practical Application
- This method of cooling is often used when people want to enjoy hot drinks without waiting too long.
- By blowing air over the coffee, it becomes comfortable to sip much quicker than if left to cool naturally.
In contrast, other options like blowing over hands or leaves may not have the same cooling effect, as the main principle of cooling through evaporation is not as pronounced in those scenarios.
When we blow air from our mouths, it can help cool certain objects or surfaces through the process of evaporation and convection. Let’s explore why blowing over coffee is the correct instance where this phenomenon occurs.
1. Evaporation Process
- When you blow air over hot coffee, the airflow helps to increase the rate of evaporation.
- Evaporation occurs when the molecules at the surface of the liquid gain enough energy to escape into the air as vapor.
- The faster the evaporation, the more heat is absorbed from the liquid, leading to cooling.
2. Increased Surface Area
- Blowing air creates movement, which increases the surface area of the coffee exposed to the air.
- This further accelerates the evaporation process, resulting in a more significant temperature drop.
3. Convection Effect
- The blowing air can carry away the warm, moist air that sits above the coffee.
- Replacing it with cooler air enhances the cooling effect, as the overall temperature of the liquid decreases.
4. Practical Application
- This method of cooling is often used when people want to enjoy hot drinks without waiting too long.
- By blowing air over the coffee, it becomes comfortable to sip much quicker than if left to cool naturally.
In contrast, other options like blowing over hands or leaves may not have the same cooling effect, as the main principle of cooling through evaporation is not as pronounced in those scenarios.
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Community Answer
Identify the instance when blowing air from the mouth helps to cool th...
- Blowing over hands on a cold day, make it warm.
- Blowing over leaves fallen on the ground makes leaves fly.
- Bowing over sharpener fillings also makes the fillings fly.
- Hence, the correct answer is blowing over the coffee makes it cold.
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Identify the instance when blowing air from the mouth helps to cool things up ?a)Blowing over hands on a cold dayb)Blowing over leaves fallen on groundc)Blowing over coffeed)Blowing over sharpener fillingsCorrect answer is option 'C'. Can you explain this answer?
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