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Checking Swelling at Equal Water Uptake 4 questions
Checking Swelling at Equal Water Uptake
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A museum tests two model coatings on detachable supports. Each dry coating has a mass of 5.0 g and a thickness of 1.00 mm. After equal time in humid air, students remove each support’s contribution from the mass reading. Only absorbed water increases coating mass in the model.
| Coating | Mass after exposure (g) | Thickness after exposure (mm) |
|---|---|---|
| P | 5.8 | 1.25 |
| Q | 5.8 | 1.05 |
Question 1
Which statement is supported by both sets of measurements?
- P absorbs more water and swells less than Q.
- Q absorbs more water and swells more than P.
- They absorb the same mass of water but have different thickness changes.
- They have the same thickness change because their final masses match.
Question 2
A conservator allows a thickness increase of no more than 0.10 mm. Use the readings to determine which coating qualifies under the tested conditions.
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The team learns that Q’s support might restrict its expansion. It can compare equally sized pieces of Q that start at the same dry thickness, one attached and the other freely supported.
Question 3
State which measurements would test the support explanation while keeping absorbed water mass comparable.
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Question 4
If free and attached Q still thicken by the same amount at equal water uptake, explain how that result affects the support explanation.
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