Clouds form when warm, moist air cools and the water condenses into droplets. But droplets need a surface on which to form. In...

Enrichment Activity 5-11 11-14

Water in the kitchen paper evaporates, taking heat from the water in the bottle and cooling it. Any breeze speeds up the...

Enrichment Activity 5-11 11-14

The rough surface of the pipe cleaners acts as a nucleation site, encouraging the salt molecules to come out of solution and...

Enrichment Activity 5-11 11-14

You should see crystals of ice form at the top of the bottle and flurry downwards quickly. Supercooled water is water that is...

Enrichment Activity 5-11 11-14

Tapping the side of the box makes the sand particles move over each other, making the heavy object fall over.

Enrichment Activity 5-11 11-14

You shouldn't sink if you jump suddenly, but if you stand on it, you'll gradually sink. The mixture is a special type of...

Enrichment Activity 5-11 11-14

Heat can flow through the metal to the ice cube, but the plastic doesn't allow it to flow so freely.

Enrichment Activity 5-11 11-14

Inside the microwave there's a quickly-changing electric field. Water molecules are slightly charged at both ends, and want to...

Enrichment Activity 5-11 11-14

Salt lowers the melting point of water so the ice melts. But the water quickly refreezes, trapping the string in place.

Enrichment Activity 5-11 11-14

The water will freeze! Water can stay liquid for several degrees below 0°C if there are no impurities or disturbances to start...

Enrichment Activity 5-11 11-14

Because ice is less dense than water, pressure from the wire squeezes and helps to melt it. (Scientists are still trying to...

Enrichment Activity 5-11 11-14