Matter Defined: Mass, Volume & Time? Unit Ideas?

[nuby]

The definition of matter is "anything that has mass and volume". Why doesn't the definition of matter mention anything about "time". Should time be mentioned as well since matter can't exist without it?
Also, If matter had its own SI unit, what would it be?

Edit:: a unit that could be considered the 'inner parts' of a kg. i.e. m^3 / kg (?)

 

[jtbell]

If matter had its own SI unit, what would it be?

Besides the kilogram, you mean?

 

[Naty1]

I think you have a good point.

Likely it's not explicitly mentioned because everything requires time to exist, I believe.

If there were no time, the nuclear, electromagnetic and other forces would be unable to propagate between particles.

 

[nuby]

Besides the kilogram, you mean?

Yes, is there another way to define matter?