The phrase "total mass" refers to the combined or overall amount of matter or substance present in an object or system. It represents the sum of all the mass of individual components in that object or system. Full definition
This is a large amount of dust, but it makes up only a fraction of a dark halo's total mass of some 1000 billion solar masses. (newscientist.com)
They have about the same total mass, and we used to think they were near - twins. (newscientist.com)
The car's performance is thus enhanced thanks to a better power - to - weight ratio and reduced total mass, which means that CO2 emissions are also lower. (lambocars.com)