You’ve been waiting for the bus and your hands become cold. When you get onto the bus and sit down, you put your hands under your legs to warm up. After a while your hands feel warmer but your legs feel colder. Explain this with regards to what you know about thermal energy transfer.

Explanation:

The First Law of Thermodynamics states that energy cannot be created or destroyed in an isolated system. In other words, energy can be converted from one form into another, but it cannot be created nor destroyed.

Conduction is the transfer of energy from one molecule to another by direct contact. This transfer occurs when molecules hit against each other, which can take place in solids, liquids, and gases.

When you put your cold hands under your legs to warm your hands up, the heat energy from your legs is being transferred to your hands through conduction. However, since energy cannot be created, there is no extra heat energy that can instantaneously replace the heat created by your legs.

Every metabolic process involves energy transfer. Since as the total energy is conserved and thus no loss or gain of energy will be there in a system and to maintain this equilibrium energy transfer from lower energy spot to higher energy spot.

Thermal energy is the energy in the form of heat and which can transfer from one part to the other as any other energy form.

As energy is conserved in a system there will be no net gain or loss of energy overall. Thus energy lost from one part travels to the other parts. Any energy forms transfer from a low intense area to high intense area.

When our hand cools down we may warm them up by rubbing on legs. Where heat energy is transferred from our legs to hands to warm it up. Thus here temperature is given to a colder part from a hot part.

This is an example of heat transfer hence, our legs cools down because some of its temperature is lost to hands still the overall temperature of the body remains balanced.

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