A student hangs a container of dry sand from a spring balance and notes the reading. She then replaces the sand with glass marbles. The student observes that the spring balance shows the exact same reading for both of them. Which quantity must be the same for the sand and the glass marbles?
density
temperature
volume
weight
209 exam-style questions on CIE IGCSE Physics Mass and weight, covering Mass and weight. Each one has a worked solution and a mark scheme showing where the marks go.