FACT OR BLUFF

Our skin gets warm after going out in sunlight.

• FACT

• BLUFF

Answer explanation

The heat emitted by the Sun gets radiated towards Earth. This radiated heat is absorbed by our skin and hence we feel warm when we go outside in sunlight. Long exposures may even burn the skin (tanning is an example).

Boiling water

• FACT

• BLUFF

Answer explanation

The water is boiled due to convection and conduction both. The vessel inside which the water is kept becomes hot first. This is due to conduction heat transfer. Then the water gets heated as a result of heat transfer between the water surface and the hot vessel. The remaining water gets hot by the process of convection.

We get burned after touching hot pan

• FACT

• BLUFF

Answer explanation

When the pan is hot and we touch it, we feel hot or burn our hands sometimes. This is due to heat transfer taking place due to conduction. The heat from hot pan is transferred to our skin as we make contact to the pan.

Teacup gets hot after tea is poured in the cup.

• FACT

• BLUFF

Answer explanation

After tea is poured in the cup, conduction takes place between the outermost layer of tea and the surface of the cup. This way the heat is transferred from tea to the cup as a result of which the cup becomes hot.

Food gets warm after heating it in microwave.

• FACT

• BLUFF

Answer explanation

Microwave is used for warming the food. The microwave sends out waves which makes the food warm. This entire heat transfer process takes place in the form of radiation.

Water gets warm after leaving the hot sun.

• Fact

• Bluff

Answer explanation

When we leave water under hot sun, the heat radiated by the Sun makes the water warm. This happens so because the water absorbs the radiated heat which in turn makes it warm. This is the same reason why we feel hot after stepping outside the house under scorching heat.

Thermometer

• FACT

• BLUFF

Answer explanation

In thermometer, the level of Mercury rises when the heat from body is transferred to it. The rise in Mercury is used to determine the temperature of our body.

Phone gets hot when its battery gets hot.

• FACT

• BLUFF

Answer explanation

When the battery gets hot due to longer operation of phone, the phone also gets hot. This is because the battery is in contact with the mobile phone. The heat is transferred from battery to the phone with the help of conduction.

Phone charger gets hot when the wires inside get hot.

• FACT

• BLUFF

Answer explanation

The wires inside a charger adaptor get hot due to excessive charging. These wires are in contact with the adaptor from inside, this way heat transfer due to conduction takes place and adaptor in turn also becomes hot.

Ice melts after being dipped in a warm drink.

• FACT

• BLUFF

Answer explanation

After dipping the ice in a warm drink, convection takes place between ice and the drink which makes the temperature of ice higher. This result in melting of ice.