1. If we keep our palm on the side of a burning candle, we don’t feel as hot as if we keep it above the flame. why? 2. What are conductors ? Give examples 3. Differentiate between conduction and convection. 4. Why is it not advisable to hold the thermometer by its bulb while reading it? 5. Why is mercury preferable as a thermometric liquid in thermometers?
Answers
Answer:
Explanation:
1.conductor is an object or type of material that allows the flow of charge (electrical current) in one or more directions.ex- rubber,steel
2.In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles. The heat transfer takes place due to the difference in temperature.
3.It is advised not to hold the thermometer by its bulb while reading the temperature because the level of Mercury increases due to our body temperature and effect the actual reading.
4.Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. ... It also has a high boiling point which makes it very suitable to measure higher temperatures. Also, it has a shiny appearance and doesn't stick to the glass surface of glass