With the rise of temperature the sensitivity of a bubble tube 

Concept:

The sensitivity of a level tube is the angle in seconds subtended at the centre by an arc of the level tube equal to one division of the tube.

Sensitivity of bubble tube increases with

• Length of tube
• The internal diameter of the tube
• Decrease in temperature

∴ With a rise in temperature, the liquid expands. Hence the bubble shortens and consequently its sensitivity decreases.

Additional Information 

Sensitivity of bubble tube, \(\alpha = \frac{S}{{nD}} \times 206265\;seconds\)

Where, s = staff intercept

n = no of divisions of bubble deviated

D = distance between staff and instrument station