The liquid commonly used in laboratory thermometers is mercury. Mercury expands and contracts evenly with temperature changes, making it ideal for accurate measurements. It is visible in the thermometer because it is a shiny, silver liquid that moves along the scale. However, because mercury is toxic and can be harmful if the thermometer breaks, some thermometers use alcohol dyed with color instead. Both liquids help provide clear and precise temperature readings in scientific experiments.
This question related to Chapter 7 Science Curiosity Class 6th NCERT.
From the Chapter 7. Temperature and its Measurement.
Give answer according to your understanding.
Alcohol or mercury.
Explanation: Alcohol is dyed red for visibility, while mercury is naturally visible but is used less due to its toxicity.
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