Question

Mercury is used as a thermometer substance
because
(a) it is very costly
(b) it expands less than glass
(c) it expands 7 times more than glass
(d) none of these reasons
​

Answer 1

Explanation:

Mercury is commonly used as a thermometric fluid rather than water because mercury has greater visibility than water

Mercury has high melting and boiling points making it a liquid over a broad range of temperature.

Since it is a metal, it has a stable coefficient of expansion hence it expands uniformly and noticeably for a slight change of temperature.

Mercury is a non sticky viscous metal and hence it makes a clear meniscus, helpful in readings.

Mercury will not expand when it solidifies hence it doesn’t break the glass tube of the thermometer.

Answer 2

Answer:

(c) it expands 7 times more than glass