The Royal Institution
Distinguished Scientist, Ri Vice President and explosives expert Chris Bishop presents another action-packed demonstration lecture.
Following on from his explorations of Chemistry and the world of Fireworks, Professor Bishop turns his attention to the use, origins and properties of explosives.
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Thank you to our Dutch friend for a brand new set of subtitles! We appreciate your efforts in helping make out content more accessible for a wider audience. Dank je!
Interesting that he blows HMX into the air and onto the floor. HMX is "highly toxic" (see https://www.ncbi.nlm.nih.gov/pubmed/28618276).
Why has this been flagged as "inappropriate for some users"?
If you want a reason why playing with explosives are bad, watch any Road Runner cartoon – brought to you by your friendly company, A.C.M.E.
Why on earth is this age restricted? Please tell me it is not to avoid kids learning how to make "explosions"
Maybe in future, you could cover TATP and binary explosives which would fill the gap from more traditional explosives. Also, maybe, the important history of detonation technology re picrates to azides could be covered? I know it's for children but there are huge gaps.
It is interesting that a few of the applications of explosions are used to save human lives. A small explosive is used to deploy the air bags in a car in a crash.
Another example is the temperature sensor in a fire sprinkler head. Commonly a small glass vial of liquid is used, and in a fire, the heat of the rising hot gases, boils the liquid, shatters the vial and destroys the part that is holding the water valve closed. This method has several advantages in that it can be tuned to the temperature desired, it is highly reliable, it works decades after being manufactured without requiring any electrical power nor charged batteries. The dispersed spray of the water is highly effective in disrupting the fire triangle by robbing the fire of heat before it can take hold. It works whether or not there are people in the building, and whether or not they have been trained as to what to do to suppress a fire. Water is a good fire extinguishing agent due to its low cost, abundance, high rate of effectiveness, and since it is not dangerous to human life, there is no need to insure that the area has been evacuated before the fire suppression means is automatically triggered. A flow sensor in the water supply for the sprinkler system, activates the fire alarm and possibly calls the fire department.
I am learning about explosives and this video showed me 60 or maybe 70% of what Ive read in the last 2 weeks. What a great lecture! Practical and very interesting! Two thumbs up!
i hated chemistry, not until i found this.
Good
What a fine teacher and superb lesson. Every subject should be taught in this manner. I can't understand why anyone would give a thumbs down.
Let's ipliilliiiìyll00iiymlll
Much respect goes to all those scientists that created the explosives we know today. None are really ever mentioned, but without their knowledge and sometimes sacrifice, we wouldn't have the world we have today. Everything from demolitions to mining of most of our natural resources and sending humans and satellites to outer space. Not to mention the end of WWII, where most speak English instead of German.
"Taming" such a potentially deadly, destructive and violent of substances (if they are ever really tamed) is an incredible feat in itself.
Should be respected at all times. And NEVER played with, unless you are a professional, and unless purchasing fireworks
Great! 👏👏👏
Age restricted okeee
Just before the last explosion, when he poured liquid nitrogen into hot water, and I thought "Vapers gone wild!"
Great stuff, impressing the next generation (as well as this one)
The most interesting thing about this children's lecture is that it is age-restricted by youtube
Wow, the most recent comment when I am commenting here is over 1 year ago. It's October 2019 right now. So much great info by Ri but so few viewers. Maybe I'll make my way over to Masha and the Bear.
55:24 reverse flash spotted
Excellent!
A wonderful demo on how interesting chemistry can be! Outstanding work by the Professor and Ri.
why is this age restricted?
I'm going to blow off your hand kid—But put on these Ear Defenders.Do you have Hand Defenders?
This is what I call entertainment. Chris you are a fantastic speaker.
How i wish this was around when i was a kid……still watching now and nearly 60…..Brilliant, at least i can direct the grand kids here….
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