Raju has a study table made of wood. The handle of its drawers are made of iron. He observed that the handles are always colder than the wooden table. What could be the reason?
Answers
Answer:
because
Explanation:
The metals are very good conductors of heat (in particular gold, silver, copper, aluminium). The fact that you feel the metal object cooler than the wooden object means that they have a temperature lower than your body temperature. Otherwise, you would feel the metal object warm/hot.
The difference of temperature between your body and those objects causes the heat to be transferred between you and those objects).
The thermal conductivity of the materials will affect how much heat is transferred. The metal object will quickly dissipate the heat from the contact area throughout its entire volume and it will keep doing that until the object will reach the same temperature as your body (this is if we disregard the temperature losses through the environment). The wooden object will absorb a small amount of heat, but being a thermally insulative material, it will not dissipate much heat from the contact area. As a result, your body won’t lose much heat when touching the wooden object.
Your clothes are made of insulative materials. That’s why you don’t see very often winter clothes made of metal… Same thing with the windows on the houses - they are made of glass, which is a thermal insulator. You want your house to retain the optimal temperature inside, irrespective of the temperature outside. That’s why you don’t see too many windows made out of metal.
On the other hand, heat sinks are made of metal and I personally have not seen too many heat sinks made out of wood.