J's answer to Jane's Secondary 4 Physics Singapore question.
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D and B are both correct, but D leads to B and B is a more significant advantage.
With a glass thermometer, any temperature change depends on one's visual observation. It may occur too fast between very short time points to recorded by hand.
Furthermore, you would have no idea what the temperature is if the liquid level lies between marked gradings (eg. If it's between 50°C and 51°C, you can only estimate it to be 50.5°C but can't be sure that it actually is 50.5°C)
A thermocouple is able to detect all these rapid changes and have them all recorded at the different time points (e.g every 0.1 seconds, which the human cannot do)
With a glass thermometer, any temperature change depends on one's visual observation. It may occur too fast between very short time points to recorded by hand.
Furthermore, you would have no idea what the temperature is if the liquid level lies between marked gradings (eg. If it's between 50°C and 51°C, you can only estimate it to be 50.5°C but can't be sure that it actually is 50.5°C)
A thermocouple is able to detect all these rapid changes and have them all recorded at the different time points (e.g every 0.1 seconds, which the human cannot do)
Date Posted:
2 years ago
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