Water has a density of 1000 kg/m3 by standard definition at its temperature of maximum density 3.98 Â°C and at 0% salinity. Scientists and engineers use water as a baseline for comparing the relative density of various materials. Water with a density of 1000 kg/m3 at 3.98 Â°C has a mass of 1000kg and a volume of 1 m3.
Spelt is a word. It is the past participle of spell. It is also a type of wheat, and therefore also a noun. It depends upon whether you are using British English (and Spelt is correct) or you are using American English.
What isn't was or might be, might meaning not yet known. Our can of beets is filled with purple fuzz is present tense. While words like our and us are pronouns - i.e. it is moldy, they are icky brown. A noun's a thing; a verb's the thing it does. Is is a helping verb. It helps because filled isn't a full verb.