Behavior of two drops. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Behavior of two drops. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Prepare a glass plate for this experiment. Wash it well with soap and warm water. When it dries, wipe one side with a cotton swab dipped in cologne. Do not touch its surface with anything, and now you need to take the plate only by the edges.

Take a piece of smooth white paper and drip stearin from a candle onto it to make an even, flat stearin plate the size of the bottom of a glass.

Place stearin and glass plates side by side. Put a small drop of water on each of them from a pipette. On a stearin plate, a hemisphere with a diameter of about 3 millimeters will be obtained, and on a glass plate a drop will spread. Now take a glass plate and tilt it. The drop has already spread, and now it will flow further. Water molecules are more readily attracted to glass than to each other. Another drop will roll on the stearin when the plate is tilted in different directions. Water cannot stay on stearin, it does not wet it, water molecules are attracted to each other more strongly than to stearin molecules.

Behavior of two drops

But this experience looks even more interesting if soot is used instead of stearin. Drop water from a pipette onto the sooty surface of the metal plate. The drop immediately turns into a slightly flattened ball and quickly rolls over the soot. So that the next drops do not immediately roll off the plate, you need to keep it strictly horizontally. Very small droplets take the form of almost perfect balls and roll easily on the record when you tilt it.

Author: Rabiza F.V.

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