Discuss any two applications of thermal expansion in liquids.
Discuss any two applications of thermal expansion in liquids.
- When a substance is heated, the molecules gain energy and move more vigorously. This causes them to move farther away from one another and the average distance between them increases. So, the substance takes up more space or expands. This expansion of matter due to heating is called thermal expansion.
- There can be three types of thermal expansion in the matter:
2.1 linear expansion—an increase in the length of a substance on heating.
2.2 Superficial expansion—an increase in surface area of a substance on heating
2.3 volume (or cubical) expansion—an increase in the volume of a substance on heating.
3. Liquids expand on heating. The amount of expansion is more than solids for the same rise in temperature.
4. Liquids show only volume expansion as they have fixed volume.
5. Different liquids show different rates of expansion for the same rise in temperature.
6. Applications of thermal expansion in liquids:
6.1 Liquid thermometers: The expansion of mercury or alcohol in a liquid thermometer is an application of the thermal expansion of liquids.
6.2 Boiling of liquids: When liquid is heated, the molecules of the liquid expand and the liquid changes its state.
6.3 Sealed bottles: Medicines bottles are left out with some space at the top so that the medicine does not spill off after expansion.
- When a substance is heated, the molecules gain energy and move more vigorously. This causes them to move farther away from one another and the average distance between them increases. So, the substance takes up more space or expands. This expansion of matter due to heating is called thermal expansion.
- There can be three types of thermal expansion in the matter:
2.1 linear expansion—an increase in the length of a substance on heating.
2.2 Superficial expansion—an increase in surface area of a substance on heating
2.3 volume (or cubical) expansion—an increase in the volume of a substance on heating.
3. Liquids expand on heating. The amount of expansion is more than solids for the same rise in temperature.
4. Liquids show only volume expansion as they have fixed volume.
5. Different liquids show different rates of expansion for the same rise in temperature.
6. Applications of thermal expansion in liquids:
6.1 Liquid thermometers: The expansion of mercury or alcohol in a liquid thermometer is an application of the thermal expansion of liquids.
6.2 Boiling of liquids: When liquid is heated, the molecules of the liquid expand and the liquid changes its state.
6.3 Sealed bottles: Medicines bottles are left out with some space at the top so that the medicine does not spill off after expansion.
