I have mouse as a pet and I sing songs to the mouse and it is many mutch me friendsly

too bad they never aired that...

bj

yeah, what a waste :D@@kingjames4886

But also modern processes foods have a massive amount of nutrients, that's actually the problem. Our body is evolved on foods in nature and processed foods have so much more nutrients that it throws it off. Pizza or fries have so many more nutrients per gram that we very easily eat way too much. Most people guess how much they eat by how full their stomach is rather than knowing how many calories they consume.

What is happening there?

That he had a MRI for testing the "lying myth" and they did not see the bad arteria in this pictures of his brain breakes my heart ...

So true

It's all about focal distance and curvature, there are solar farms that use parabolic mirrors to heat up a central tower.

Building a steam cannon that works isn't the assignment. The reason they didn't build the thing you describe is that the ancient greeks didn't have valves that would allow them to store the pressure. Steam in a pressure vessel launching a projectile isn't a myth, they show that a design with a valve would work in the end of the episode.

The pressure chamber simply doesn't have enough thermal mass to effectively transfer the high temperature to the water. Instead of flash boiling the water, they're simply cooling down the tube. Them adding more water just cools the tube better. The copper nails they added from the demo to hopefully increase the surface area worked because it also increased the thermal mass.

He is still around? Cause you are a granny..

Sure, but that should not apply if the air inside the cannon is properly hot. The Leidenfrost effect does not account for closed-system pressure vessels.

@@weckar Yes it does.

@@bikerfirefarter7280 The leidenfrost effect is in effect when the temperature difference between 2 surfaces (one of them containing, being coated in, or being water or other liquid capable of rapidly reaching gaseous state) is so great that water is repelled from the surface and thus not instantly vaporized. It does not take into effect closed systems, mobile systems, gaseous matter at high temperatures or liquid at high temperatures. The leidenfrost effect does nothing if you pour water into hot cooking oil for instance.

@@Kanakotka I know what the leidenfrost effect is, I use it when glass-blowing, water and bees-wax is used, it's also used with anti-spatter when welding etc.

@@bikerfirefarter7280 But yet you claim it is somehow relevant in a closed system.

I think they were trying to test the design plan itself rather than proving if you could make a working steam cannon. And also the plan might just come from Ancient Greece, but it was most likely just a rough mockup without any testing or deep consideration because it seemed fun to think about and so it kind of failed.

its not the warmth or cold of the barrel, its the volume. if the water isn't converted into enough steam to fill MORE than the barrel, than the bullet has little chance to come out. because the steam just pushs so far against the weight of the ball, til it runs out of steam (pun intended)

However pressure isn't everything as the volume of steam also matters to put more force behind the ball. Steam locomotives always were about the balance of steam pressure and steam volume. This is why high pressure locomotives never really became a thing because it just wasn't worth it as the volume of steam wouldn't change. Steam power also has the unique property that the pressure of the steam prevents more steam from forming. which means a long barrel matters more than it would have with compressed air. Cause as the steam escapes the superheated water turns to steam. This is why locomotives can maintain a constant boiler pressure because as steam escapes more steam is greater from the superheated water to keep the pressure up. The only thing is that steam expansion cools things down so you have to add enough heat to compensate.

My guess is lack of thermal mass, heating xKg of steel pipe by y°K gives you zJ of energy which gets dumped into aKg of water which needs to go from b°K to c°K. If we use dJ to represent the required joules for the water, zJ must be >= dJ otherwise it just won't work. zJ is a function of temperature and weight (thermal mass), you can increase the temperature but if you add xKg of copper around the heated chamber is the equivalent to doubling the temperature. More mass becomes less efficient as it increases due to distance from the surface area so you'll need water channels drilled down into the extra mass. Now you're getting into heat flux, rate of transfer of energy and that's where the surface area (copper nails down the barrel) comes into it. Roughen the surface area of the chamber, steam tubes down into the extra mass, copper nails for surface area. Finally, a really obvious one they either forgot or just forgot to mention: Delta T, change in temperature Water boils at 374°K. I'm going to guess from a few googles that tap water is 300°K. So the machine has to provide enough joules to raise xKg from 300°K to 374°K. Let's change that to 350°K by preheating the water. Now Delta T is 24°K instead of 74°K, the energy requirements are reduced by ⅔.

wrong

Maybe they should try again the first model, which had barrel made of copper followed by wood. Maybe if most of the barrel was made from wood, that would work. That's probably what you're saying.

Jamie has stated himself that Adam was difficult to work with due to how often they butted heads; while they never hated each other, their constant bickering (while entertaining television for us) always kept them as coworkers; never friends. And Adam's propensity to get ahead of himself also stood in direct contrast to Jamie's methodical work process, not to mention his need for cleanliness.

jamie owns that workshop? holy fucking shit

dat Pianoguy he’s actually one of the most interesting people on the planet. Master diver, special forces, owned a pet store, was a fish trainer. Has clocked more scooba hours than most people have walked on the ground. Lives on a boat, I’m sure there’s loads I’m missing

Tony Oakley :O i did not know that.

im more on Adam's side. While Jamie is more responsible and act like an adult, the specialness of mythbusters comes from both of them. The show is basically for grown ups to feel like kids. I would love to work with Adam because he is like a child and he doesnt take himself so seriously. As annoying as it is on a temporal level, people like Adam sparks ideas. I had a coworker just like him, he lightens up your mood during the toughest days and create at worst a child tantrum.

Dan Christensen I completely agree, I would also say that it needs a shorter barrel and lighter propellant. Wouldn't it be better to pressureize boiled water and then release the steam, no?

More than that: - The barrel is too long and cold and the steam loses energy to it. - Steam undergoes almost adiabatic cooling in the barrel. Also, the last design might be feasible if the projectile itself seals the steam tank and gets pushed out by by steam at a certain pressure level.

there is no check valve, meaning that when they open the valve to drop the water they leave a port open where the energy can release from..., I am a gas fitter and plumber by trade, Ive literally made a working steam cannon.. we shot potatoes... basically a potato cannon but using steam .. was awesome.

And they didn't use warm water. For a good Steamflash you need water which is at 80-90 °C this would reduce the Leidenfrost effect and you don't loose time heating the water up.

@@MrDmadness We used to make potatoe cannons with hairspray 15 years ago, was great untill we accidentally shot out the neighbours window :)

Haha, didn't even notice 😂

Calories is just a measure of energy not nutrition. Like a chocolate bar will provide more energy than a piece of broccoli when digested but there's more to nutrition than just energy. You also need certain "building blocks" for your body. So yeah just using calories is kind of a flawed metric

Yeah, another thing is that even if the myth was about calories rather than nutrition, the cardboard box may have more calories but as it cannot really be fully digested it's basically zero, at the very least for humans. Also for example 1 gram of uranium has 2 billion calories and yet we aren't using it to solve world hunger, with the mythbuster logic here, you'd just pop a gram every 27 397.96 years or so and you're solid

They filled it with copper nails for a similar effect.

Pphahaha XD It seems to me that someone pushed him, and he is like: “Agh, I’ll hug u!” Or they just have kind of a living machine with a soul, and because of depression (MB destroyed many of his kind) it hit the man with pipes and gears!.. yeah.

Perhaps they told him he stood in the shot orso, but yeah it seems like he is fighting but that seems unlikely :P

Do you mean the kind which was available 2000 years ago?

The kind available to archimedes and da Vinci?

Because you find your golf ball at the bottom of a hole in the green does not imply the golf ball made that hole.

@@slots1407 WOW what are the odds that the cannonball found a hole exactly the dimensions of itself.

Not to mention the embankment nearby to where they found the cannon ball looked like it was smashed by something hard, maybe the ball hit that then bounced to where they found it

Yes.

Exactly. These guys don't have a clue about nutrition, and it shows.

That wouldent work. Pouring molten metal in to water would just create a laidenfrost effect, and then boil the water. Not turn it in to steam instantly. Hot metal cools of really quickly in water. And the water often dosent even get hot, it hets luke warm. I'm a blacksmith, and have accidently dropped stuff I worked on in to the cooling bucket, and had to retrieve it whit my hands. So i know werry well, how warm the water becomes after being in contact whit glowing hot metal repeatedly trough out a day. Even by quenching lets say a axe in a small bucket of water repeatedly, dosen't manke it hot, just warm.

Vance McCarthy but have you seen the pressure vessels and compressors

Ice?