Zero is the freezing temperature of water on which temperature scale?

Amount of liquid measured in l or lm

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

Light waves can move through , but they travel fastest when they move through a(n) .