Q2 Answer all of the following parts (a), (b), (c), etc. (a) What is the difference between temperature and heat?
(b) The temperature of a body is 300 K.What is its temperature in degree Celsius? (c) Explain the term thermometric property.
(d) Why it is necessary to have a standard thermometer?
(e) Give the equation that defines temperature on the Celsius scale. (f) What is the thermometric property of a thermistor?
(g) What is the temperature of the boiling point of water in kelvin? (h) What are the two requirements for devising a temperature scale?
(i) Give an example of a practical thermometer and state the thermometric property it is based on.
(j) Give a reason why infrared thermometers are becoming more commonly used in clinical situations compared with the traditional clinical alcohol thermometers.
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‘SECTION B’
HALF QUESTION Typical of Question 12 in Leaving Cert. Exam
Q3 Answer both of the following parts (a) and (b).
(a) In the early part of the 18th century the German-Dutch engineer Gabriel Fahrenheit invented the first standard thermometer scale.The lowest temperature that he could produce in his lab was in a mixture of ice, water and salt; he used this as the lower point for his temperature scale.The upper point was body temperature. He defined his scale so that 0 °F was the lower point and 32 °F was the temperature of melting ice, which gave the upper point a value of 96 °F. The Fahrenheit scale was later redefined so that the boiling point of water is 212 °F, giving normal body temperature a value of 98.6 °F.
(i) To calibrate a thermometer, a thermometric property and two fixed points are needed. Fahrenheit used a mercury thermometer.What is the thermometric property for that type of thermometer?
(ii) Give two examples of thermometric properties, other than the one used for the mercury thermometer.
(iii) What is temperature?
(iv) We now know that zero degrees Fahrenheit is not the lowest temperature possible. Who is credited with discovering absolute zero?
