Chapter Name: Heat
Activity Name: Heat and Cold in Heat
In this experiment, we will compare the temperature of a piece of wood and a piece of metal after both are kept in a fridge or icebox for 15 minutes. The goal is to understand the concept of heat transfer and why we perceive one material as colder than the other.
- Piece of wood
- Piece of metal
- Fridge or icebox
- Friend to assist in the experiment
Step by Step Procedure:
- Place the piece of wood and the piece of metal in the fridge or icebox.
- Set a timer for 15 minutes and wait for the materials to cool down.
- After 15 minutes, take out both the wood and metal pieces from the fridge.
- Ask your friend to touch both materials and note their observations.
- The metal piece feels colder than the wooden piece.
- Handle the metal and wooden pieces carefully to avoid any injuries.
- Make sure the materials are not left in the fridge for an extended period, as extreme temperature differences might damage the materials.
Lesson Learnt from Experiment:
The experiment helps us understand that when objects are kept in a fridge or icebox, they lose heat energy and become colder. However, the perception of coldness is related to the transfer of heat energy between our body and the object.
When we touch the metal or wooden piece, heat energy from our finger is transferred to the materials, making them feel cold. Conversely, when heat energy flows out of our body, we perceive a sensation of coldness, while heat energy entering our body gives us a feeling of warmth.