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TGC3:
Boiling water
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LINKS |
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Video of water boiling
Students should notice:
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Large bubbles,
which seem to be streaming away from certain points
at the bottom of the beaker (Note: All parts of the
water in the beaker should be at the same temperature,
but bubbles are more likely to form on small scratches
and imperfections in the glass surface) . |
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The bubbles rise
to the surface and ‘break’. There is mist
above the surface of the water, which students may refer
to as ‘steam’. (Note: ‘steam’
is sometimes used to mean water in the gas state, too.
In order to avoid confusion, we do not use the word
‘steam’ on this CD-ROM.) |
‘Think for Yourself’ questions and answers
‘What are the big bubbles?’
The bubbles are water in the gas
state. (Note: It is important to ask the question to establish
this point. Some
students have difficulty in conceptualising what the bubble
is and don’t make an automatic connection to the
syringe experiment or the particle model explanation).
‘Is the mist water in the gas state or in the
liquid state?'
Liquid state: we cannot see water
in the gas state; the mist is tiny droplets of water in the
liquid state.
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Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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