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.
Re: Wrong/wrongly; Spelled/spelt Spelt is a grain, specifically a type of wheat. Spelled is the more common spelling of the past tense of spell (particularly in American English, as Tdol said), but spelt is acknowledged as an alternate spelling and appears to be the more common spelling in British English.