because you don`t know what it is and it might be very harmful if it gets in to your eyes.
Safety goggles protect your eyes from liquids that could splash up and cause serious damage.
Decantation usually refers to pouring liquid. It can be just pouring liquid from one container to another, or removing the liquid from a solid sediment by pouring the liquid off and leaving the solid behind.
liquid
That is the correct spelling of "pouring" (dispensing liquid).
The Liquid Image Goggles are special because it's a hands free camera that can be used underwater. It's similar to Google Glass. You can get more information at the Liquid Image Co website.
A jug for pouring some kind of liquid
A physical change.
It is important to let the sand settle at the bottom of your beaker so that the sand is separated from the liquid.
By heating the lead into a liquid and pouring it into a mold
1.51
Pouring off can only separate solids or liquids with a different density than the solution.
I believe that it means that your analysis of your data enables you to absolutely identify your unknown liquid as that specific liquid and no other liquid.
They aren't unknown- there is gas, liquid and solid