Mass: Mass refers to the amount of matter in an object or substance – think about it as how many clothes you're trying to pack into your suitcase.
Volume: As mentioned before, volume is about how much space something takes up – this would be your suitcase size in our analogy.
Specific Gravity: This term compares an object’s density to water’s density. If you've ever wondered why some things float while others sink when placed in water, specific gravity has your answer!