Why Did We Spend 3 days Answering the Wrong Question?

Why did we spend 3 days trying to figure out what mass, volume, and matter is when the question is "Can matter disappear?". This is because matter is made up of mass and volume; weight and space being taken up. To find the answer to this question, we have to first find out what matter is made of and can that stuff disappear. When matter disappears, that would have to mean that the weight that was there on the Earth is gone and the space that was being taken up is empty.
See, if we study about what really is matter, then can we fully understand and answer the question of Can Matter Disappear?