Answers to Questions Kids Ask! - Where "Why?" Turns to "Wow!"
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September 19, 20111931 - Brook Benton
1934 - Brian Epstein
1928 - Pete Murray
1933 - David McCallum
1940 - Zandra Rhodes
1940 - Bill Medley
1945 - Kate Adie
1946 - Michael Elphick
1948 - Jeremy Irons
1949 - Twiggy
1963 - David Seaman
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…
Why are eggs egg-shaped?
This question seems like a tough one to crack, but scientists have one very sensible theory: the ovoid shape gives an egg its incredible strength! You can see this amazing…
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…