Why you need to wear safety glasses – Periodic Table of Videos

published on July 13, 2020

we have an amazing demonstration away safety glasses are important in the lab it's a very simple demonstration sealed tube of water heated up in front of some Tomatoes two of the tomatoes are wearing safety glasses two of them we used

Tomatoes because tomatoes are a bit like eyeballs and we thought it would be much too gruesome to get real eyeballs from the butcher when we heat one of these sealed tubes they called Krakatoa tubes after the volcano that exploded

Catastrophically in the late 19th century as you heat it the water begins to boil water turns into steam the volume of steam is much bigger than the volume of water so the pressure goes up and up and up and can reach several

Hundred atmospheres if the glass is really strong then suddenly and pieces of glass fly everywhere and if you look at the poor tomatoes you can see that the tomatoes without the safety glasses were pierced by pieces of

Glass one of them was actually peeled gives a new meaning to having your eyes peeled you could see where the glass had gone through the eyeball but like all demonstrations that we do we thought we would do it several times in the second

Run the glass tube wasn't strong enough and it went off with a really quite small bang in fact in high speed you can see the tube flying away like a rocket the third tube was an enormous explosion really even neil our gallant technician

With a bit safer in this case the eyeballs with the safety glasses were slightly damaged because the explosion blew the glasses up and of course in our simulation there

Isn't a nose so some of the glass got through the gap where you would normally have your nose the protecting effect of the glasses we call them glasses they're actually made out of plastic polycarbonate if you look close up you

Can see where the plastic has been pitted by the flying bits of glass the safety glasses are probably not useable again afterwards because of the scratches but you can throw those away you can't throw where your eyeballs more

Than once

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