List five advantage of thermal expansivity and five disadvantage of thermal expansivity
Answers
Answer:
advantages
- Press fits. If objects didn't expand thermally, we would have a more difficult time creating press fits. You can heat up one object, cool the other, and put them into each other. When they reach thermal equilibrium it creates a tight fit that's difficult to separate.
- use of expansion by heat is for switches on many types of machinery and home appliances in the millions of cars are operated by using the expansion of metal Thermometers are another example
- Bi-metallic thermometers work, because of the difference in thermal expansion.
- Thermal expansion differences are also used to get tight mechanical joints through interference fit.
- Fish get to live under the ice, because ice floats and “warmer” water is trapped beneath. this is advantageous for fish and water living mammals
Disadvantages
- civil engineering. Particularly railroads and bridges. You need to design both with occasional gaps, otherwise the rails and bridge will buckle.
- if you need to use different materials, you need to be aware about how each will expand or contract so you avoid additional stresses in your designs.
- Internal combustion engines need to be designed to allow for expansion and contraction of metal parts
- Fish get to live under the ice, because ice floats and “warmer” water is trapped beneath. this is disadvantage to humans