It's not good stuff, and it's from inefficient combustion, not from combustion itself.

Any common denominators in cases of spontaneous combustion?

Oxygen is needed for combustion.

And sometimes you'll hear the word enthalpy.

But enthalpy is closely related to heat.

Because I used to say what is enthalpy?

But it's good to know this word enthalpy.

The internal combustion engine is not sustainable.

Change in enthalpy is really just change in heat.

Spontaneous human combustion is rare and scientifically unexplainable.

So this is our internal combustion engine for creativity.

Pollutants like this derive mainly from the combustion of fuel in car engines.

Refined tylium contains tremendous enthalpy to the order of half a billion megajoules per kilo.

Carbon monoxide is a poisonous substance formed by the incomplete combustion of carbon compounds.

As a matter of fact, I invented the combustion engine and the twoway nappy.

There have been hundreds of millions of internal combustion engines built, compared to thousands of Stirling engines built.

And just remember, all of these things, whether we're talking about heat, kinetic energy, potential energy, enthalpy.

Because you're like, I don't know what enthalpy is in my everyday life.

What about the internal combustion engine, which was invented in 1879?

The internal combustion engine took off because weight mattered, because you were moving around.

From playing with it, they learn some basic principles about fire, about intake, combustion, exhaust.

Anybody who's trying to sell you biofuels, or this kind of thing, what do you do about the thermodynamic inefficiency of combustion engines?

Atmospheric explosions, or full combustion, takes about 15,000 times longer than what happens in your car.

It's heat content. For our purposes, when you hear someone say change in enthalpy, you should really just be thinking of change in heat.

So it's the same idea as a jet engine, it's just the heat source was the reactor rather than the combustion of fuel.

If you put that same fuel in an internal combustion engine car, you get about 20 percent efficiency.

You'll hear them in different contexts, and you're like, I thought I should be using heat and they're talking about enthalpy.

But after the Stirling engine, Otto came along, and also, he didn't invent the internal combustion engine, he just refined it.

and we're making great progress for this goal is to have a propulsion system based on hydrogen and fuel cells, designed and validated, that can go head to head with the internal combustion engine we're talking about obsoleting the internal combustion engine and do it in terms of its affordability, add skill volumes, its performance and its durability.

And when you allow the proper chemical reactions or the proper combustion to take place, what it does is it expels gases, ultra high velocities out the back of your rockets.

Well, that's great for roasting marshmallows, but then when you get to high school chemistry and you're studying combustion reactions, all of a sudden you understand why oxygen is needed for fires.

The fuel cell looked great one tenth as many moving parts and a fuel cell propulsion system as an internal combustion engine and it emits just water.

Then instead of a burner here that would be injecting fuel, like a combustion system, you would have this heat exchanger with a reactor. It would make the air hot, then the air would exhaust through the turbine and make thrust.

(Laughter) is the energy from the sound via the air and gas molecules is influencing the combustion properties of propane, creating a visible waveform, and we can see the alternating regions of compression and rarefaction that we call frequency, and the height is showing us amplitude.

But, in any event, if you can burn it with the same efficiency because it's external combustion as your kitchen stove, if you can burn any fuel, it turns out to be pretty neat.

I am the perceiver of thoughts, of emotion, of time, of actions, of reactions, of interactions, of change, of hope.

I am the perceiver of thoughts, of emotion, of time, of actions, of reactions, of interactions, of change, of hope.

Me was composed of stories, of cravings, of strivings, of desires of the future.

City of Future, City of of Tomorrow?

Traps are of many kinds of wood, of steel, of words.

look like pictures of humans, of insects, of fishes, of birds.

They die of suicide, of overdose, of violence, of accidental deaths.

Of all of you.

Of what? Of what?

Of course, of course.