Because fingerprints can add a considerable mass to the crucible when weighing it.
measure the crucible without water
The crucible gets EXTREMELY hot...
how should i know?? you should go ask an expert
you should :)
It should be under the floor mat behind the rear seat. Get your fingers under it right up against the seat.
No. They should be cooled on a low rack on a countertop in the regular room temperature air. Conversely, pies should be cooled on a window sill- with the window open- so all neighbors and passersby can enjoy the aroma.
We want to weight exactly only the material - variations of the crucible mass lead to errors. That's why the mass of the crucible must be stabilized.This is very important in gravimetry, it is a basic rule.
Put It In A Plastic Container, Leave The Lid Open Till Its Cooled Down Then Close It And Put It In The Fridge. :)) But Make Sure You Dont Leave It In There For To Long.
You should wash your fingers before and after. But do so alone
a normal color for the tops of your fingers should be the same color of the rest of your fingers