A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that
is opaque
has high density
has regular expansion
has a high thermal conductivity
can wet glass
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The correct answer is C. has regular expansion.
A liquid-in-glass thermometer operates by using the thermal expansion of a liquid to measure temperature. When the temperature of the liquid changes, it expands or contracts, causing the level of the liquid in the glass tube to rise or fall accordingly. The temperature is then read from a scale on the glass tube.
To quickly register temperature changes, the liquid used in the thermometer should have a regular and predictable expansion coefficient. This ensures that the liquid will respond quickly to changes in temperature and that the thermometer will give an accurate reading.
Opaque liquids (answer A) would prevent the observer from seeing the level of the liquid, and high density (answer B) and high thermal conductivity (answer D) are not directly related to the speed at which the thermometer registers temperature changes.
