L2 Precision - Part 2
Completion requirements
Unit B: Measurement
Measurements will be listed as a range in order to account for the margin of error.
Uncertainty is written as a ± value at the end of the measurement.
The precision of the scale above is 1 g . The uncertainty is 0.5 g . Therefore, the mass of the walnuts would be written as 221 g ± 0.5 g.
The mass of the walnuts can be calculated as follows:
221 g – 0.5 g = 220.5 g
The precision of the scale above is 1 g . The uncertainty is 0.5 g . Therefore, the mass of the walnuts would be written as 221 g ± 0.5 g.
The mass of the walnuts can be calculated as follows:
221 g – 0.5 g = 220.5 g
and
221 g + 0.5 g = 221.5 g
The actual mass of the walnuts would be between 220.5 g and 221.5 g.
Note: If the scale is not calibrated, the measurement of 221 g may not be accurate.
Measurement tools are used in the fields of math, science, and engineering.
A measurement tool can be
The actual weight of the egg is 1.56 g. The reading on the scale displays 2.00 g. Is the scale accurate and precise, only accurate, or only precise? Explain.
The actual mass of the walnuts would be between 220.5 g and 221.5 g.
Note: If the scale is not calibrated, the measurement of 221 g may not be accurate.
Measurement tools are used in the fields of math, science, and engineering.
A measurement tool can be
- accurate and precise
- only accurate
- only precise
Amad is weighing eggs that were laid by a small bird.
The actual weight of the egg is 1.56 g. The reading on the scale displays 2.00 g. Is the scale accurate and precise, only accurate, or only precise? Explain.
The scale is not accurate since the measured value of 2.00 g is not close to the actual value of 1.56 g. The scale is precise since it measures the weight of the egg to the nearest 0.01 g. Therefore, the scale is only precise.