Raindrops aren’t tear shaped?
They are round when they leave their cloud and by the time they hit the Earth, they have a flat bottom and a round top, like the top half of a hamburger roll. This is because surface tension keeps the drop nearly spherical, but the air stream flattens it at the base.
Roughly one in ten of the world's population do not have access to safe drinking water, that’s about
748 million people.
(WHO/UNICEF Joint Monitoring Programme Report)
In a 100-year period, a water molecule will spend: 98 years in the ocean, 20 months as ice, 2 weeks in lakes and rivers and less than a year in the atmosphere.
The small cloud that forms from your breath (when you breathe out on a cold day) consists of millions of tiny droplets of water. That’s because the cold air outside your body cannot hold as much water vapour as the warm air inside your body. It condenses changing briefly from gas to liquid.
It’s the effect of evaporation that makes you shiver when you stand around in wet bathers on a breezy day. Some of your body heat is lost as the water molecules evaporate into water vapour. Heat is required to change water into water vapour. The evaporation of the water removes heat from your body.
Water's composition (two parts hydrogen to one part oxygen) was discovered by the London scientist Henry Cavendish in about 1781.
The colours in a bubble come from white light, which contains all the colours of the rainbow. When white light reflects from a soap film, some of the colours get brighter and others disappear. That depends on how the light waves interfere with each other.
When an object floats the water is pushing upwards on the object. Just like when you try to push a surfboard under the water you can feel the water pushing the board up. Objects such as rocks that have sunk, are still experiencing an up-wards push; it is just not as strong as the weight force.
10% of the moisture found in the atmosphere is released by plants through transpiration.
All plants need water to survive and capillary action is how plants get that water. Water moves from the ground into the plant's roots, then throughout the plant through millions of tiny tubes called xylem. This is how the plant "drinks" water. Finally the water reaches the leaves and evaporates out into the air.
Did you know...
Water Cycle Boogie
Animated video with a Student narrator explains evaporation, condensation & precipitation.
Animated video of precipitation, evaporation and the flow of groundwater
Primary aged US child doing experiment demonstrating how to make a water cycle in a bowl, (gladwrap, ice, hot water)
Prepare your own acid indicator from a red cabbage and use it to look at how acidic things in your kitchen are!
Did you know?