Related, but off topic.
If you ever visit Taiwan, be sure to eat the local pineapples. We have one of the sweetest pineapple and we eat the core of the pineapple. The core is actually crunchy, like the constancy of a crispy pear.
good to know
1000°c seems accurate:
Fun little science fact: Heated objects glow the same colors no matter what they are made of. It’s called Black Body Radiation. The color chart shows what temperatures correspond with various “colors” of glow.
Heated objects glow the same colors no matter what they are made of
True only if light emissions aren’t dominated by chemical effects or filtered by structural effects. Plenty of materials burn at different colors. Although if you wait out the chemical reactions and keep it heated, it does eventually end up with just blackbody radiation too 🤷
Unless it is a gray body. For somewhat accurate measurements you must do math.
But corrected by emissivity factor. Emissivity factor is also not constant, and changes as both a function of material and temperature. Probably associated with band gap fluctuating wrt. Temperature
Aluminium doesn’t glow, even when molten though?
That simply means it must melt below 600°C.
A quick wiki check says it melts at 660. I guess if you’re in a really dark room, you could see the glow.
Real bodies are gray, not black.
All bodies matter.
Eventually will glow human eye visible if you keep heating it past useful temperatures. 1000’C+ starts getting red hot.
Doesn’t emit light as readily as iron does, especially with iron’s oxide layer building up when heated.
Which makes iron a suitable substitute for tungsten at 3000 C
My friend calls pineapples ‘Dragon Eggs’ and tossed one into a bonfire. Pulled it out later to have the most delicious roasted sweet mythical egg ever
Mother of pineapples
Sounds tasty. I can vouch for lemons undergoing a similar transformation. Wrap them in foil, seal it really well, and chuck them near a fire or bbq. They come out soft, sweet, and delicious.
Before Maillard invented his reaction in 1912, you would have just gotten a burnt lemon
That was nice of him! Thanks, Maillard!
I would like to subscribe to lemon facts.
Lemon Facts
Thank you for your interest in subscribing to Lemon facts. Here are some sample facts to get you started:
- The lemon tree is evergreen of the family Rutaceae.
- They are a hybrid of the bitter orange and citron.
- The most common variety seen in supermarkets is ‘Eureka’, which fruits throughout the year.
- Lemon juice is a natural cleaning agent. Mix with water and, optionally, vinegar for a handy glass cleaner.
- Two lemons are enough to provide your recommended daily intake of vitamin c.
You can subscribe to more Lemon Facts for just 10.99 per day! Please reply with your creditccard details to subscribe, or ‘disagree’ if you do not wish to subscribe at this time. We may retain your details to offer you the opportunity to subscribe to other lists in future.
Please may I also subscribe and thank you in advance.
Like, in the middle of the fire? For how long? Wanna try it in the future
Tossed it in when the fire was at peak flame, and then waited for the wood to burn, the pineapple looked like a big piece of black coal
I need to try this. A full pineapple into the flames naked?
It works for breadfruit as well, my favourite way to cook it. You’d believe it has turned to charcoal, but no, the inside is like sweet bread fresh out the oven. I like to cut it in half and scoop it out with a spoon
Pineapple can be naked, if anyone else is naked, I suggest not jumping into the flames
Roasted pineapple is delicious. Coat it on some brown sugar, roast it, then carve off the toasted bits. Repeat.
Isn’t the pineapple sweet enough that sugar could be omitted?
Look, I’ve got a sweet tooth.
I need to try that
Iron? I suspect otherwise… My dear RHNB, I miss your red hot nickel ball.
I’ve been watching Tech Ingredients search for the best shield material to test their Drone destroying extreme high power laser setup indoors for obvious reasons.
It turned out to be fruits/veggies. Nothing else came close. So he went with panels filled with thickened water.
ooo, i never thought of using blue tape the way he does, to keep crumbs and shit off a surface i was going to be finishing/sealing later. that’s a good idea
edit: also i guess if i show up to a protest strapped in cukes, you all now knnow why
That makes sense. The specific heat of water is a real bastard to overcome.
I’m personally skeptical of laser based weapons, given that they have one wavelength. once one is developed and deployed, it will be trivial to paint drones with a reflective paint specific for that wavelength.
The results is a nation investing 100s of millions on a weapon, that once deployed will be countered by 1000s $ of spray paint.
imagine if you could get a t-shirt that could deflect a any bullet. that’s what still happen with laser based weapons.
I think that wouldn’t necessarily work once you get to the right wavelengths for it to start interacting with the organic bases of the paints. There’s only so much you can do when someone shoots an infrared laser at the resonant frequency of a C=C double bond.
Wasn’t that 1500 whatever-the-unit-was? Below 1000 whatever-the-unit-was was the fingerprint bands, 3400ish whatever-the-unit-was was the O-H bonds, 3100ish whatever-the-unit-was was N-H bonds, 2900ish whatever-the-unit-was was the triple-to-C-H bonds, etc.
Ugh. The lab portion for that was so tedious. We would have to sketch the expected resonance patterns by hand for a bunch of different molecules. I loved the simplicity of the hydrogen bond nuclear resonance imaging so much more.
uh, frequency is Hz (hertz) unit to my memory. if that’s what you’re using
It could also be scaled (THz) or when working with light given as a wavelength (nm) and sometimes even photon energy (eV).
I mean, it sounds right. It’s been so long that I’ve forgotten.
Honestly, I memorised the bands once in orgo, and never looked at them again, so you’re more likely to know than I.
chemist was my weak point at uni. and I’m too tired to look that up, what’s the frequency. I want to check if there are materials that can reflect it.
the coating doesn’t have to be organic, a thin metallic coating might reflect the laser.
I’m not giving an expert opinions. but I’m personally betting that any laser weapon will be useless within weeks or days.
So, did a bit of research and, when you get to the scale of “a laser that can destroy objects”, it turns out that the reflectance of natural materials is just utterly insufficient. Consider the following: suppose that a mirror finish reflects 90% of the light from a laser in the range you’re looking at (a fair assumption, from what I’ve read). Now, let’s do some basic back-of-the-napkin math: we’ll use a 30 kW laser, which is apparently standard for current destructive laser weapons. Let’s further assume that the laser light is spread over a surface area of 0.04 m^2 (because a spot 20 cm on a side seems to me a fairly high estimate for the spread on a precision laser, even on a moving target, if it’s motion-tracked, I should think). Let us be generous and assume that this reflective paint coating is 0.5mm (0.0005m) thick. Given the paint’s approximate specific heat of 2.302 J/gK (polyethylene) and density of 1400000 g/m^3 (PVC), and let’s also assume the breakdown temp of the reflectance is near the boiling point of PVA (spray paint), which is 112C.
So, the mass of paint absorbing the energy is 0.04*0.0005*1400000=28 g.
To heat the entirety of these 28 g of this material by about 90C (from 22 to 112), completely destroying the protective layer, we would need 2.302*28*90 = 5801J
Now we know that we have 30000*0.9= 3000J/s, so it would take about 2 seconds of lancing to completely destroy the protection. Given that it already takes 2-5 seconds to destroy things with the laser, and it doesn’t actually have to destroy the entire area for the reflectance to deteriorate and let the laser through, this would only be adding another second of work. I think that, no matter what you do, the laser’s gonna win.
I can give sources for any of these estimates.
You know the actual reason why these things aren’t on every military vessel? The lasers stop working if there’s fog, dust or rain
Thanks for the numbers. it seems that paint coat is a good shield but not perfect.
I think monochromatic mirrors can reach 99.9% reflection.
There will be a arms race between stronger lasers and thicker stronger laser protection.
a silver coating on a water cool plate might be able to completely block a strong laser, but that might be too heavy for a drone.
I never knew a disintegration ray was possible.
Huh, well keystrokes for later
“My armour is like tenfold shields, my teeth are swords, my claws spears, the shock of my tail is a thunderbolt, my wings a hurricane, and my breath death!..Wait, is that…pinapple skin armour?? Oh, shit, I’m so fucked!”
(Dragon does dragon stuff)
Sir Pinappleus the Hawaiian: You absolute fool.so does this make my balls permanently sweet or what
The pineapple will be just fine the flesh touching the steam on the other side spread all over your body by the pineapple keeping it pressed against your skin on the other hand is going to have a nice chard bbq taste.
If the steam doesn’t get you, the enzymes breaking down your proteins would surely give you horrible skin irritation.
Why was the pineapple discarded? They could have eaten it 😭
I believe it’s just the skin
Right but it says “the skin of a discarded pineapple” — meaning the pineapple was discarded, not the skin. Just a silly grammar joke.
Don’t worry. It’s a black deck, so the graveyard is exactly where the pineapple wants to be.
I know, right? I’ll even eat the stickers, nothing goes to waste!
and what happened to the card
It got dissed.
What it did to deserve that, we might never know. . .
Knights Of The Pineapple! Arise!
I hurt my knee; can I remain seated?
they said arise, not stand up. grab that little piston lever on the side of your seat and scooch upward an inch
Damm and free roasted pineapple after
Does it work when the skin is properly dried though? Armor would dry out over time.
Ya, it’s all a big lie brought to you by billionaire dragons. They’re just trying to get you to wrap yourself in a tasty garnish so that they get a nice citrus flavor once they are done roasting you.
You’ll have to keep moist and wet. Oh so wet.
This gives me God Emperor of Dune vibes.
It’s only valid if it’s the RHNB.
