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What is the function of a capillary tube in a laboratory thermometer?
  • a)
    To store extra liquid
  • b)
    To allow the liquid column to expand and show temperature changes
  • c)
    To cool down the thermometer quickly
  • d)
    To measure pressure
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
What is the function of a capillary tube in a laboratory thermometer?a...
The capillary tube contains a liquid column that expands or contracts with temperature changes, indicating the temperature reading.
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What is the function of a capillary tube in a laboratory thermometer?a...
Function of a Capillary Tube in a Laboratory Thermometer
A laboratory thermometer is a precision instrument designed to measure temperature, and the capillary tube plays a crucial role in its functionality.
Understanding the Capillary Tube
- The capillary tube is a narrow, elongated glass tube that is connected to the bulb containing the liquid (usually mercury or colored alcohol).
- Its size is specifically designed to allow easy movement of the liquid inside.
Liquid Column Expansion
- When the temperature increases, the liquid in the bulb expands due to thermal energy.
- This expansion causes the liquid to rise through the capillary tube.
- The narrow diameter of the tube ensures that even small changes in temperature result in noticeable movement of the liquid column.
Visible Temperature Changes
- The scale marked on the thermometer is directly aligned with the capillary tube.
- As the liquid rises, it aligns with the scale, allowing for accurate temperature readings.
- The design ensures that the liquid's movement is smooth and responsive, facilitating quick and precise measurement.
Conclusion
In summary, the capillary tube in a laboratory thermometer is essential for allowing the liquid column to expand and accurately show temperature changes. Its narrow structure ensures that even minor temperature fluctuations can be detected, making it a vital component for precise temperature measurement in laboratory settings.
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