Answers to Questions Kids Ask! - Where "Why?" Turns to "Wow!"
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August 25, 20101918 - Leonard Bernstein
1917 - Mel Ferrer
1930 - Sir Sean Connery
1938 - Frederick Forsyth
1942 - Howard Jacobson
1947 - Ann Archer
1949 - Martin Amis
1954 - Elvis Costello
1956 - Matt Aitken
1961 - Billy Ray Cyrus
1970 - Claudia Schiffer
Osmosis is the phenomenon of water flow through a semi permeable membrane, a fundamental effect in all biological systems. It is applied to water purification and desalination, waste material treatment, and many other chemical and biochemical laboratory and industrial processes. When two water (or other solvent) volumes are separated by a semi permeable membrane, water will flow from the side of low solute concentration, to the side of high solute concentration. The flow may be stopped, or even reversed by applying external pressure on the side of higher concentration. In such a case the phenomenon is called reverse osmosis.
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Why in some places, like the desert, is it very hot in the day and very cold at night?
This is because rocks (including sand) have low heat capacities (the amount of energy needed to raise their temperature). This means that they heat up easily during the day, and…
What is Air made out of?
Air is primarily made up of two elements, nitrogen and oxygen. Nitrogen makes up 78.05% of air and oxygen another 20.95%. The remaining less than 1% is primarily argon, but…
Why doesn’t alcohol freeze?
Alcohol will freeze, but only at extremely low temperatures. Water’s freezing point is 0 degrees Celcius, but the freezing point of ethanol (the alcohol you’re talking about) is -114 degrees…
Can you drink sea water?
Water from the sea is too salty to drink. Although your body needs salt, it is possible to have too much of it. See, your body is made of cells…
How is snow made?
Snowflakes are extremely beautiful objects and it is amazing that such patterns form randomly. However, that is just how they form. As you probably know, a cloud is just water…