Circular Perspex Block for Refraction Science at Home_Earth Science Use for investigation of gas

Use for investigation of gas at constant volume By inserting the glass bulb into either warm or cold water the expansion and contraction to the air contained in the bulb can be seen as a pressure change on the gauge

running battery-free for repeatable classroom and stockroom use

and classroom precision measurement

sized to fit the PH0380A bar-breaking apparatus for repeated thermal-contraction fracture demonstrations

and raised molded graduations

Circular Perspex Block for Refraction Science at Home_Earth Science Use for investigation of gasRound perspex refraction block, the curved face geometry letting beams enter along any radius for clean Snell's law angle work in ray box and refraction setups.