Lifechanger Online Academy - Measurements(Physics)

Measurement is the process of determining the magnitude of a physical quantity by comparing it with an accepted standard unit. Key concepts include accuracy (how close a measured value is to the true value), precision (how close repeated measurements are to each other), and resolution (the smallest change an instrument can detect). Common measuring instruments include the meter rule (0.1 cm resolution, suitable for large objects), vernier caliper (0.01 cm resolution, for small measurements like diameters and thickness), and micrometer screw gauge (0.001 cm resolution, for very precise measurements). Parallax error occurs when the eye is not directly above the scale during reading, and can be prevented by positioning the eye vertically above the mark being read.