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Jolly's Bulb and Gauge

Jolly's Bulb and Gauge

£199.99 exc. 20% VAT(£239.99 Inc. VAT)


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  • Hollow ball with connected manometer
  • Demonstrates changes in pressure in closed air volumes
  • Once immersed in water, accurate readings can be made
  • Investigates the behaviour of ideal gases
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Jolly's Bulb and Gauge

Jolly's Bulb and Gauge is a palm-sized, hollow metallic ball with connected manometer for demonstrating changes of pressure in a closed volume of air upon being heated or cooled. Immersing the ball in a water bath at a specific temperature allows the relationship between pressure and temperature of the enclosed air to be investigated in order to demonstrate the behaviour of an ideal gas.


  • Hollow ball: 60mm diameter
  • Manometer: 840 - 1240hPa
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