The bulb has a capacity of 7cm³ and the stem beneath is graduated 3×0.1cm³ allowing for expansion over a range of 100ºC. 
Science Lab Supplies with a glass U tube with a bulb and tap at the upper end of one limb, other limb open. 
The apparatus can be supported by a single clamp.
From the bottom of the U is an outlet tube which passes through a bung and terminates into a tap. 

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Charles Law Apparatus

SKU: SL-238