A laboratory experiment requires finding the density of a liquid
PHYSICS · Subjective · A Level · Physics · Measurements and their errors · Measurements and their errors
Problem
A laboratory experiment requires finding the density of a liquid.
The following measurements are recorded:
• Mass of liquid: 45.30g
• Volume of liquid: 12.5cm3
(i) Determine the number of significant figures in each measurement.
(ii) Calculate the density of the liquid, expressing the final answer with the correct number of significant figures and proper units.
(iii) If a second trial mistakenly records the mass as 45g instead of 45.30g, discuss how this change affects the number of significant figures in the density value and the implied precision of the result.