How does a Fan give us Cool Air? + more videos | #aumsum #kids #science #education #children

TL;DR

Fans help us cool down by blowing away the stagnant layer of hot air around our body, while hot air balloons float because the hot air inside them is less dense than the air outside. Plastic combs attract paper due to the static electricity they gain after being rubbed on dry hair.

Transcript

It's AumSum Time. How does a fan give us cool air? Because it has a refrigerator inside it. Oh. You are just unbelievable. First of all, a fan does not give cool air. Our body loses heat mainly in two ways. Firstly, our body heat gets transferred. To the surrounding air through a process of convection. Secondly, the sweat produced on our skin absor... Read More

Key Insights

• 🥵 Fans help cool us down by removing the hot, humid air layer around our body, promoting heat loss.
• 👱 Hot air balloons float due to the density difference between the hot air inside and the surrounding air.
• 👱 Plastic combs attract paper through static electricity generated by rubbing them on dry hair.
• 👋 Metallic combs do not attract paper because they are good conductors of electricity.
• 👱 Density plays a key role in the floating of hot air balloons, with hotter air being less dense than cooler air.
• 🏛️ Electric charges can build up on objects like plastic combs, enabling them to exert an electrical force on other objects.
• 👻 Conductivity determines whether an object can accumulate an electric charge or allow it to flow away.

Questions & Answers

Q: How do fans help us cool down?

Fans blow away the stagnant layer of hot, humid air around our skin, aiding in the continuation of convection and evaporation processes, which facilitate heat loss and cooling.

Q: Why do hot air balloons float?

Hot air balloons float because the air inside them becomes less dense when heated by the burner. The increase in temperature causes the air molecules to spread apart, making the hot air less dense than the surrounding air and resulting in buoyancy.

Q: How does a plastic comb attract paper?

Rubbing a plastic comb on dry hair generates an electric charge known as static electricity. This charge enables the comb to exert an electrical force on the paper, causing the paper to be attracted to the comb.

Q: Why doesn't a metallic comb attract paper like a plastic comb?

A metallic comb does not attract paper like a plastic comb because metal is a good conductor of electricity. It allows the electric charges to flow through it onto the earth, preventing the comb from becoming electrically charged and attracting paper.

Summary & Key Takeaways

• Fans facilitate the cooling process by blowing away the stagnant layer of hot, humid air around our skin, allowing for the continuation of heat transfer through convection and evaporation.

• Hot air balloons float because the air inside them becomes less dense when heated by the burner, causing it to rise and make the balloon buoyant.

• Plastic combs attract paper after being rubbed on dry hair because the process creates a static charge, allowing the comb to exert an electrical force on the paper.