This apparatus designed for demonstration for visible in whole class. 
A column  mounted vertically in front with a plastic safety cover.  
Boyle’s law shows for an ideal gas at constant temperature, the product of its pressure and volume is always constant. 
Scale graduated on the post form 0 to 620mm. the gauge from 100 to 400 kPa. 
Air is confined in the tube by colored oil.
Product Weight:3kg
Overall size: 200x180x750mm

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Boyle’s Law App

SKU: SL-703