Litmus paper can be used in aqueous solution, and to check vapor also. It turns blue litmus paper red because it is slightly acidic.
Carbon Dioxide
Smash Lab - 2007 Co2 Cop Car 1-12 was released on: USA: 26 March 2008
potasium
check their privates
Weigh an unopened can of coke. Then, open it and let it sit for a whole day, allowing it go completely "flat," meaning all the CO2 has bubbled out. Then weigh it again. The weight of the can cancels out because it doesn't change, so the difference in weights is the amount of CO2 that escaped. Congratulations, you just contributed to global warming.
The reason why, is because so they can check what is wrong with them. Also to check for infections.
check out this link http://www.laboratoryequipmentworld.com/chemistry-lab-equipment.html it talks about a few types of apparatus and their uses.
You cannot unless you have a gauge installed, or know the exact weight of the tank.
The answers to the lab are written inclusively in the lab itself. Check your data or try something else.
I had a lab check for the Amethyst I have, they have mechanisms to assure the originality of it.
to check the measure size
check