@miwuscience: Classic cup covering experiment - but enlarged version! The atmospheric pressure experiment in the textbook can still be played like this! #scienceexperiments #pressuer #fyp #scienceexperiment
This experiment may seem simple, but it actually involves a sophisticated game involving multiple factors. We know that the success of the experiment lies in the difference between the external atmospheric pressure and the pressure inside the cup. If there is residual gas in the cup, the pressure difference is mainly caused by the decrease in gas pressure due to the expansion of gas volume; If there is no gas in the cup, the pressure difference is directly the balance between atmospheric pressure and the gravity of the water column. However, in addition, water will also have extremely weak volume expansion when inverted, thereby reducing its own pressure; The surface tension of water allows for a slight gap between the cover plate and the cup, which is also a key factor in the success of the experiment. Therefore, simple experiments may not be that simple, but it's okay - the experimental results will always give the answer