Find an astm method for conducting calibration tests for these three instruments a balance (either an analytical or a top loader), a visible / ultraviolet spectrophotometer, and a ph meter.

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k