Question

Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?

Answer 1

The reason explaining the above-given phenomenon:

• Paheli could easily open the bottle after dipping the upper end of the bottle with the metal cap in hot water can be explained on the basis that metal possesses the property of expansion on heating.
• As the metal cap is known to have lesser specific heat than glass hence before the glass starts to expand, the metal expands which causes the inside diameter of the metal cap to expand and loosen up.
• The expansion of any material can be explained by the kinetic energy possessed by its atoms.
• Hence When a material is heated, the increase in energy helps the atoms and molecules to move faster and take up more space, which causes expansion.

Hence, the reason why Paheli could easily open the bottle after dipping the upper end of the bottle with the metal cap in hot water has been explained above.