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Correcting Balance Zero Error
The student used a balance to measure the mass of the ring.
After the ring was removed from the balance, the reading on the balance was 0.02 g.
How could the student use the readings from the balance to determine the correct mass of the ring?
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Marking points
- 1 Subtracts the 0.02 g residual reading from the ring-on-balance reading.
Full-mark answer
Subtract 0.02 g from the reading obtained when the ring was on the balance.
Why this answer loses marks
Zero the balance and measure the ring again.
The question asks how to use the readings already taken. Treat the after-reading as a fixed offset and subtract it from the ring-on reading.