Hi guys. I know that mass is the amount of matter in an object and weight is the pull of gravity on an object but here's what I don't understand. How can grams be used to measure mass? Let's say an object is 200 grams - which would be like 200 paper clips, right? Would the object still be 200 grams in space? Doesn't a gram measure weight, not mass? So confused. And how can we effectively teach the difference between the two when all students' experiences are grounded on Earth, where the terms weight and mass can be used interchangeably?