Question

Please Solve this worksheet!! Please

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Answer 1

• Insulators

• lab

• night

• summers

• heat is transferred by conduction when adjacent atoms vibrate against one another, or as electrons move from one atom to another. Conduction is the most significant means of heat transfer within a solid or between solid objects in thermal contact. Fluids—especially gases—are less conductive.

• Clean thermometer before and after you use it with either rubbing alcohol or lukewarm soapy water, then rinse with cool water. Wipe it dry with a clean cloth or let it air dry.

• Heat transfer is due to difference in temperature not due to difference in internal energy. Two bodies having different internal energies but having the same temperature, then there will be no flow of heat.

• Normal body temperature varies by person, age, activity, and time of day. The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the "normal" body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C).

• 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.

• In conduction, the heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, the heat transfer occurs through electromagnetic waves without involving particles. The heat transfer in convection is faster.

1. The precautions needed while using a laboratory thermometer are:

• It should be kept upright not tilted.

• Bulb should be surrounded from all sides by the substance of which the temperature is to be measured.

• The bulb should not touch the surface of the container.

1. The small silvery ball in a mercury thermometer can be dangerous if the glass breaks and the mercury is not cleaned up properly. The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife. Each thermometer contains about .