The sensitivity of the thermometer is the ability of the thermometer to detect a small change in temperature. Here are some of the factors that influence the sensitivity of glass thermometers

• Thickness of the glass wall
  • A thicker glass wall reduces the sensitivity of the thermometer
• Diameter of the capillary tube
  • The smaller diameter of the capillary tube, the greater the sensitivity of the thermometer
• Size of bulb
  • larger bulb means more sensitivity because there is more surface area in contact
• The thickness of the capillary tube
  • Thinner capillary tube is  more sensitive since contraction and expansion of the mercury is more obvious