3 Questions
The water tank should be kept at a pressure of approximately the water vapour pressure at the given ______ for at least 2 hours
temperature
The scales should be sensitive to ______ of the mass of the specimen both while in air and while being submerged in water
0.05%
The state of constant mass of the dry specimen is assumed to be reached when the difference between two weighings, 24 hours apart, is less than ______ of the mean value of the two readings.
0.1%
Study Notes
- The vacuum chamber should be at a temperature of 20±3°C and a pressure of 1 05±5°C
- The specimen should have a volume of not less than 0.001 m3
- The vacuum chamber should be maintained at a pressure of 1 05±5°C for a period of at least 24 hours
- The water tank should be kept at a pressure of approximately the water vapour pressure at the given temperature for at least 2 hours
- The scales should be sensitive to 0.05% of the mass of the specimen both while in air and while being submerged in water
- The state of constant mass of the dry specimen is assumed to be reached when the difference between two weighings, 24 hours apart, is less than 0.1 % of the mean value of the two readings.
This quiz covers the testing requirements for the vacuum chamber and specimen, including temperature and pressure conditions, specimen volume, maintenance duration, water tank pressure, and sensitivity of scales for mass measurements.
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