I know this book is made of matter because it is something around me. Now you think of something that is made of matter.
If there is a 'something' there, then trust me, there is matter in it.
No, because matter is something that takes up spaces, and matter is something that you cant see.
There is not anything in the world that is not made of matter, because something that is not made of matter is not anything at all.
You say that something is a matter when there is mass and occupies space.
A vacuum consist of anti-matter; the opposite of matter...matter is something and anti-matter is nothing. When something is added to the vacuum the anti-matter is displaced and only matter will now remains. If you were made out of anti-matter then your observable results would be the opposite. Matter and anti-matter cannot exist in the same space; only one of the two can exist in any place at any one time. When you remove matter from a space the only thing that can exisist in that space is anti-matter!
matter
An idea is not matter (and sometimes does not matter either).
Yes, matter can be something that you can not see. This is because one form of matter is gas, which can not be seen.
Everything that consumes something of matter expels something of matter. So yes, they do.
If it has mass and volume, it is matter.
If something has mass it is matter.