A In your copy, go investigate. 1. What materials is a bulb thermometer made with? 2. Describe what mercury looks like in its typical state. 3. Why are liquids used to measure temperature? 4. What other thermometers are now used instead of mercury thermometers? 5. Why are these other thermometers used? 6. What does ‘room temperature’ mean?


B In your copy, give your opinion.


1. Explain in your own words how a bulb thermometer works. 2. Would a thermometer made with very thick glass work well? Why/Why not? 3. What special property makes mercury the best liquid for use in a thermometer? 4. Why is this special property useful to accurately measure the temperature? 5. What might it mean if your body temperature is higher than 37.5°C? 6. What do you think is the most important use of a thermometer?


C Vocabulary: Match each word from the text to its meaning. scale


volume expand optimum accurate


1. An important quality or characteristic of a thing 2. A series of equal steps or marks used for measurement 3. The best or most favourable circumstance 4. To describe, explain or identify the properties of 5. To increase in size 6. Without error or mistake 7. The amount of space an object or substance occupies


D Cloze procedure: ‘Fahrenheit and Celsius’. Fill in the blanks. The earliest thermometer was known as a thermoscope. It could only


was getting hotter or Fahrenheit invented the


in 1709 and later used mercury was the first time that changes in


if something


and could not measure the temperature. Daniel Gabriel thermometer with a standard scale. He first


alcohol


1742, the Swedish astronomer Anders Celsius introduced the simpler 100 degrees between the freezing This scale is used in many areas of the


1714. He introduced the Fahrenheit scale in 1724. This could be measured accurately. In scale of


(0°C) and the boiling point (100 ) of water. today.


69 define property


Mercury


Unit 12 | Explanatory Text 1


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