Many pebbles in an empty cup (How much space is occupied by the pebbles?)
Answer (1)
When many pebbles are placed in an empty cup, they occupy the space inside the cup, displacing the air that was originally there. The amount of space they occupy is equal to their combined volume, including the gaps between the pebbles. If water is poured into the cup afterward, it will fill the spaces between the pebbles, showing how matter occupies space and has mass.
