I spilled a glass of water yesterday. After I cleaned up the
mess, I started wondering Why is water wet?
Who could help me? Professor Brian Cox! He answered
ten science questions for the Big Bang Fair.
Why is water wet?
Wetness is our description of what we feel when we put our hand
in water. Saying water is wet is like saying that wood is hard or
fire is hot.
Sensory receptors on our hand send information about the water
to our brain. Our brain receives the information from our sensory
receptors and processes it. A combination of temperature, pressure
and the way water moves tells our brain that water is wet.
Dip your fingers in warm water. Now, try dipping your fingers in
other liquids - milk, orange juice or a fizzy drink. Do all the
liquids feel wet? Do all the liquids feel the same? What about the
liquids feels different?