You are blowing hot air to muddy the water in order to not have to admit you are wrong. You are trying to slowly change your statement that "mass is just a number" into something different, by blowing a bunch of HOT AIR! You are fooling nobody but yourself if you think it's working. You have no idea who you're talking to! I certainly am not arfa brane, so stop mentioning his views when it's me you're responding to. You said, "Mass is a measure of a quantity of substance. It is not the substance itself." NO! Mass is the quantity of substance itself, and you MEASURE that quantity of substance. You still do not understand the difference between an object and a measure of that object! Learn the difference. Objects have a quantity of substance, which is measurable using numbers and units! The object has a quantity of substance whether you measure it or not. What you are claiming is that mass is just a measurement. Measurements don't have inertia! You still don't get it!