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Checking a Temperature Probe at Two Phase Points 4 questions
Checking a Temperature Probe at Two Phase Points
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class checks a temperature probe using pure water at 1 atm. In the model, ice and liquid water coexist at 0.0 °C and water boils at 100.0 °C. The probe gives the readings shown when the two phases are present.
| Reference condition | Expected temperature (°C) | Probe reading (°C) |
|---|---|---|
| Ice and liquid water | 0.0 | 1.5 |
| Liquid water and steam at 1 atm | 100.0 | 101.5 |
Question 1
Which possible probe error fits both readings?
- The probe reads 1.5 °C too low.
- The probe reads 1.5 °C too high.
- The probe reads correctly at both points.
- The probe always reports twice the true temperature.
Question 2
Why does using two reference points give stronger evidence for a fixed offset than using the ice-water point alone?
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In a second test, another class uses a verified probe and a lower air pressure. The boiling reading is below 100.0 °C, while the ice-water reading is still close to 0.0 °C.
Question 3
Explain why the second class should consider pressure before treating its boiling reading as a probe error.
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Question 4
Describe how to check whether the second probe has an offset using the boiling reference from the first test.
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