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?
Put the bulb in a beaker of boiling sea water.
Put the bulb in a beaker of boiling pure water.
Put the bulb in a beaker of ice and salt.
Put the bulb in a beaker of pure melting ice.
An ice cube is placed in a beaker and is heated.
The ice melts to form water, which evaporates at first and then boils.
The steam condenses on a cold window in the room.
Which process involves a transfer of energy from the ice, water or steam to the surroundings?
melting
evaporating
boiling
condensing
On a warm day, a carton of fresh milk is covered with a wet cloth.
Why does this help to reduce the temperature of the milk?
Some water evaporates from the cloth so the remaining water becomes cooler.
The water has a very high specific heat capacity.
The water insulates the milk from the warm air around it.
Water is always colder than the air around it.