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19 Cards in this Set
- Front
- Back
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Thermal expansion |
solid liquid and gases expand when they are heated . |
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show that metal bar expands when it is heated |
-When it is cold the iron bar will just fit in the gap in the measuring device -The bar is heated and now it is too long to fill in the gaps -When it cools down the bar contracts and comes back to its original shape |
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What is used in shipbuilding and other industries to join metal plates . |
A red hot rivet is passed through the holes in the 2 metal plates and the hammed until the ends are rounded . As the rivet cools it contracts and pulls the 2 plates closely . |
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what should we do when a metal lid or cap sticks on the glass jar or a bottle and its hard to unscrew it . |
Heating the lid by running hot water on it causes it to expand so that the lid losses and can be removed . |
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how is a tyre made |
a steel tyre maybe fitted onto the wheel of a railway while the tyre is very hot . it then cools and contracts, so that it fits tightly to the wheel . |
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bimetallic strip |
-designed to bend as it gets hot . -Made out of 2 metals . -one metal expands more rapidly , causing the strip to bend . the outside curve expands more quickly as the outside covering is longer than the inner one . -they are used in fire alarms and thermostats . |
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why does glass container cracks if we put a hot liquid |
inner surface of glass expands quickly ., before the heat has conducted through the outer surface . |
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eg of glass that expands on very little heating |
pyrex |
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Eg of glass that expands docent expand much |
toughened glass , it has been treated with chemicals to reduce the chance of cracking . |
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metallic bridges expand on hot days |
so they have kept gaps in between sections which decreases . and now railway lines are usually made from alloys that expand very less . |
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linear scale |
if it is divided into equal divisions |
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why is clinical thermometer better than liquid thermometer . |
Safer for the children who mite bite and break the glass thermometer ecofriendly |
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why do we need to keep the thermometer for a min or 2 in our body |
to see the correct reading . it it could be that the thermometer was kept at a cold place like 20 degrees and the patient body temperature could be 37 degree so it will take time for the thermometer to reach its temperature |
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thermal equilibrium |
when 2 objects at different temp are in contact with each other and the state is reached when no energy is being transferred from each other |
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_____ expands slowly than ______ and tthey expand more slowly than _____ |
solids expand slowly than liquids and they expand more slowly than gases |
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kinetic theory |
particles are constantly moving and have kinetic energy. The higher the temperature the faster they move , so the more kinetic energy they contain . |
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how does energy flow |
from the hotter object to the cooler one |
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Particles in the hot object will l ____kinetic energy, whereas particles in the cold object will_____energy. |
Particles in the hot object will lose kinetic energy, whereas particles in the cold object will gain energy. |
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Objects at the ___________will have the same average kinetic energy per particle. |
Objects at the same temperature will have the same average kinetic energy per particle. |
