The phrase "solid mass" refers to something that is condensed and without any empty spaces, either in physical or abstract form. It denotes a substance or object that is firm, dense, and does not easily break apart or change its shape.
Sentences with «solid mass»
The minimum for building solid mass would be around 1 to 1.2 grams / per lb per day. (fitnessandpower.com)
That way you're not dealing with a frozen solid mass when you get home. (rudisbakery.com)
As each individual builds its own calcium carbonate living chamber, its chamber is joined to adjacent ones to make a rigid solid mass, rather like a large apartment complex. (AmbergrisCaye.com)