Question

A piece of wood is a matter with not a quantity why

Answer 1

Listen carefully

Matter are the substance which made up of particle and occupy space , have mass
Thus u see a wood piece which have some mass ' its solid and made up of its particle so when u put wood piece any where u can see it will occupy space
Eg
Put on floor u can't see floor part which wood piece cover

Thus u understant how wood be a matter