The plural is powders. look in this site http:/dictionary.reference.com/browse/powder
Synthesis is the singular form, syntheses is the plural form, and syntheses' is the plural possessive form.
The plural form of liquid is liquids.
The plural form of the noun laboratory is laboratories.The plural possessive form is laboratories'.
The plural form of the noun synthesis is syntheses.The plural possessive form is syntheses'.
"mg" is a measure of weight, the form (solid, powder, liquid etc) is irrelevant.
Bridges is the plural form of bridge.
The plural form of the noun 'powder' is powders, a word for 'types of' or 'kinds of' powder. Example: The display of powders ranged from simple to exotic. The singular noun 'powder' is an uncountable as a word for a substance. Example: The dressing table was covered with powder.
"Groceries" is the plural form of "grocery."
There is no plural form for the word, countries. This word itself is a plural.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of "meter" is "meters."
It has no plural form.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.
The plural form of rung is rungs.
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
The plural of "she" is "they", so the plural of "she had" is "they had".
The plural form is founders. The plural possessive is founders'.