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Reading a Thermometer - Laboratory Thermometer Video Lecture | Crash Course for Class 6

FAQs on Reading a Thermometer - Laboratory Thermometer Video Lecture - Crash Course for Class 6

1. What is a laboratory thermometer and how does it work?
Ans. A laboratory thermometer is a device used to measure the temperature of liquids and gases in a laboratory setting. It typically consists of a glass tube filled with a liquid, usually mercury or colored alcohol, that expands and contracts with temperature changes. As the temperature rises, the liquid expands and moves up the scale, while it contracts and moves down the scale when the temperature decreases. The scale is marked in degrees Celsius (°C) or Fahrenheit (°F).
2. What is the difference between a laboratory thermometer and a clinical thermometer?
Ans. The main difference between a laboratory thermometer and a clinical thermometer is their intended use and the temperature range. A laboratory thermometer is designed to measure a wider range of temperatures and is used in scientific experiments, while a clinical thermometer is specifically designed to measure human body temperature and has a narrower range, usually between 35°C and 42°C. Additionally, clinical thermometers often have a faster response time for measuring body temperature.
3. How should a laboratory thermometer be read accurately?
Ans. To read a laboratory thermometer accurately, first ensure that the thermometer is placed vertically and not touching the sides of the container holding the liquid. Observe the level of the liquid in the capillary tube and read the temperature at the bottom of the meniscus (the curve formed by the liquid). Always read the scale at eye level to avoid parallax error, which can lead to an inaccurate reading.
4. Why is mercury used in laboratory thermometers?
Ans. Mercury is used in laboratory thermometers because it has a high thermal conductivity, allowing it to respond quickly to temperature changes. It also has a uniform expansion rate, which provides accurate readings, and it remains in a liquid state over a wide temperature range (from -39°C to 356°C). Additionally, mercury does not wet the glass, which helps in obtaining clear readings.
5. What safety precautions should be taken when using a laboratory thermometer?
Ans. When using a laboratory thermometer, it is important to handle it carefully to avoid breakage, as the glass can shatter. Always hold the thermometer by the top and avoid touching the bulb. If using a mercury thermometer, be cautious, as mercury is toxic. In case of breakage, follow proper safety procedures for cleaning up and disposing of mercury. Additionally, do not place the thermometer in extreme temperatures beyond its range, as this can damage the instrument.
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