Question

a substance has no mass,can we consider it as a matter

Answer 1

No, we cannot consider it as a matter. This is because a matter is anything that has mass and occupies space. So, if the substance do not have any mass then it cannot be considered as a matter.

Answer 2

matter is something which can occupie space and has mass. if a substance has no mass then we cannot consider it as matter.
HOPE ITS HELPFUL DEAR.