Friday, 23 November 2018
Saturday, 10 November 2018
Physical and Chemical changes
How does it work?
When
you drop a piece of dry ice in a bowl of water, the gas that you see is
a combination of carbon dioxide and water vapor. So, the gas that you
see is actually a cloud of tiny water droplets. The thin layer of soap
film stretched across the rim of the bowl traps the expanding cloud to
create a giant bubble. When the water gets colder than 50°F, the dry ice
stops making fog, but continues to sublimate and bubble. Just replace
the cold water with warm water and you’re back in business.
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