Science Experiments Ideas
Fill a wineglass to overflowing with dried peas, pour in water
up to the brim, and place the glass on a metal lid. The pea heap
becomes slowly higher and then a clatter of falling peas begins,
which goes on for hours.
This is again an osmotic process. Water penetrates into the pea cells through the skin and dissolves
the nutrients in them. The pressure thus formed makes the peas swell. In the same way the water
necessary for life penetrates the walls of all plant cells, stretching them. If the plant obtains no more
water, its cells become flabby and it wilts.