An electric clothes dryer recirculating air is used to dry wet laundry.
Warm, dry air is blown into a drum containing wet clothes. The air absorbs moisture from the clothes.
State the name of the process by which liquid water from the wet clothes becomes water vapour in the air.
The moist, warm air then passes through a condenser where it is cooled.
Describe and explain one way, other than temperature, in which the air leaving the condenser is different from the air entering the condenser.
Description:
Explanation:
The drum of the dryer rotates about a horizontal axis. As it spins slowly, the clothes are lifted up and then fall back down through the warm air currents.
Name the force that causes the clothes to fall downwards.
When the drum is set to spin at a very high speed during the water-extraction phase, the clothes do not fall but remain pressed against the drum's inner wall.
State the direction of the resultant force on the clothes that keeps them moving in this circular path.
Suggest why hanging wet clothes on an outdoor washing line is more environmentally friendly than using an electric clothes dryer.
528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.