I think our polypropylene measuring cylinders must shrink with age or autoclaving. The black lines mark the height of the water when this '500 ml' cylinder is filled with 500 grams of water. (Well yes, the temperature is only ~20°C, not 25°C). The markings are off by about 50 ml!
Ancient Stories Provided An Early Warning About Potential Seattle Earthquakes
10 hours ago in History of Geology