Short answer questions D. Answer in brief. 1. Give two important effects of heat. 2. Why do electric wires sag between poles on a hot day? 3. Why are liquids used in a thermometer? 4. Name the three commonly used scales of temperature. 5. Under what conditions is it better to use alcohol instead of mercury in a thermometer?
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Why do electric wires sag between poles on a hot day?
The lines are often heavily loaded because of increased power consumption, and the conductors, which are generally made of copper or aluminum, expand when heated. That expansion increases the slack between transmission line structures, causing them to sag.
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- The important effects of heat on an object are listed below: 1) Raises the temperature. 2) Increases volume. 3) Changes state.
- The lines are often heavily loaded because of increased power consumption, and the conductors, which are generally made of copper or aluminum, expand when heated. That expansion increases the slack between transmission line structures, causing them to sag.
- Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures
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