3 application of contraction in materials
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Three applications of contraction in materials are-
1. If we keep a very hot glass under cold water it cracks because the glass contacts
2. Rivets
Rivets are fitted when hot and then hammered flat. On cooling, the rivet contract, pulling the two plates firmly together.
3. Thermostat
It is a device that can be used to control the temperature of a room. It uses a bimetallic strip. It is connected to a heater circuit. When the temperature of the room rises beyond the set value, the bimetallic strip expands and bends away breaking the contact. Hence the heater circuit is switched off.
The strip cools and contracts and the contact is remade switching on the heater circuit. The setting knob is used to adjust the temperature at which the thermostat is switched on and
1. If we keep a very hot glass under cold water it cracks because the glass contacts
2. Rivets
Rivets are fitted when hot and then hammered flat. On cooling, the rivet contract, pulling the two plates firmly together.
3. Thermostat
It is a device that can be used to control the temperature of a room. It uses a bimetallic strip. It is connected to a heater circuit. When the temperature of the room rises beyond the set value, the bimetallic strip expands and bends away breaking the contact. Hence the heater circuit is switched off.
The strip cools and contracts and the contact is remade switching on the heater circuit. The setting knob is used to adjust the temperature at which the thermostat is switched on and
gunjananand:
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