sanding a piece of wood

crushing an aluminum can

melting an ice cube

dissolving sugar into water

molding a piece of silver

All of the above are the same substances even after they are changed

wood chips are still wood

a squashed can is still a can

water is still a form of ice

sugar water is still sugar and water

molded silver is still silver

baking bread is different, because you add heat, and dough is definitely different from bread

volume unit

– formula is Mass/Volume

– unit can be grams/centimeters cubed, or grams/milliliters

1quantity

2dissolving sugar into water, melting an ice cube

3 volume (cubic)

2. crushing aluminum can

3. volume