The diagram shows a liquid-in-glass thermometer.
A student wishes to check the marking of the upper fixed point on this thermometer.
What should she do?
1 )
Put the bulb in a beaker of boiling sea water.
Put the bulb in a beaker of boiling pure water.
3 )
Put the bulb in a beaker of ice and salt.
4 )
Put the bulb in a beaker of pure melting ice.
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