Recent comments in /f/explainlikeimfive
nmxt t1_iuhem3m wrote
Liquid water evaporates at all temperatures, so puddles disappear because they evaporate. The evaporation is somewhat faster with higher temperatures and slower with lower temperatures. Evaporation happens from the open surface of water. The larger the surface, the faster the evaporation. For this reason a puddle evaporates faster than the same volume of water in a glass. Boiling, however, happens throughout the entire volume of water at the same time, and is therefore much faster than simple evaporation.
apokalypse124 t1_iuhejy8 wrote
The thing that's missing is water evaporates due to heat energy, not boiling. Boiling makes water evaporate quickly, but water can evaporate near its freezing point just more slowly.
twotall88 t1_iuheiwc wrote
Reply to comment by TheODPsupreme in ELI5 - How do puddles evaporate if water turns to gas at 100 Celsius? by takeonme02
>Water starts evaporating at anything above zero Celsius at sea level and 1 atmosphere of pressure
Water will sublime from solid form (ice/snow) well below zero Celsius (32°F). It just takes a sunny, dry day and the sun will give the water molecules enough energy to skip the liquid stage (sublimate). It can be considered evaporation loosely.
rosen380 t1_iuhebwo wrote
Reply to comment by CyclopsRock in ELI5: How exactly do we get some much power from engine now, than we did 40, 50, 60 years ago? by Micromashington
I dont know about many cars, but in 1990 they ran a mostly stock Corvette ZR1 for 24 hours averaging >170MPH, setting some auto endurance records. And the car was so worn out at that point, that they continued on for almost 5 more hours
JaggedMetalOs t1_iuhe9nb wrote
Reply to comment by I3reezyCarrot in ELI5: How exactly do people die of old age? by MirielTheDog
The special telomere repairing protein (telomerase) is active in Humans. It's what resets the telomere length in embryos, and it's also active (but not enough to fully replenish them) in any body tissues that need to regenerate.
One place it's fully active is in cancer cells. It's theorized one of the functions of shortening telomeres is to prevent cancer, because any cancer starting to grow will burn through its telomeres and die, unless the cancer cell is able to mutate to repair its telomeres.
[deleted] t1_iuhe4zn wrote
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drafterman t1_iuhe3iu wrote
Because boiling isn't evaporating. Water boils at 100 C but can evaporate at any temperature above 0 C.
The temperature of some amount of water is basically the average kinetic energy of its molecules. Some molecules will have more energy and some less.
Some of the molecules with more energy will be at the surface.
And some of those high-energy surface molecules will have enough energy to overcome the surface tension of the water and pressure of the air above it and shoot off into the air.
This is evaporation.
So, over time, any body of non-frozen water will slowly evaporate.
TheODPsupreme t1_iuhdymt wrote
Water starts evaporating at anything above zero Celsius at sea level and 1 atmosphere of pressure: this is because evaporation is diffusion of molecules due to differences in pressure and concentration, not just boiling. Heat speeds up the process, but is not the primary force behind this.
skaarlaw t1_iuhdym4 wrote
Reply to comment by OneAndOnlyJackSchitt in ELI5 Why are airport ceiling so high? by TrShry
Been eyeing this game up for a while, so tempted but don't want to timesink in to another game right now!
__s10e t1_iuhdx79 wrote
Reply to comment by Klai8 in ELI5 Why are airport ceiling so high? by TrShry
Is ventilation another reason? The huge volume provides sufficient oxygen for anyone inside for quite some time even if ventilation breaks down.
ThePrem t1_iuhdx5m wrote
Reply to comment by Rampage_Rick in ELI5 Why are airport ceiling so high? by TrShry
Yes that was my point. The original comment I replied to stated that you couldn’t use chilled water to locally control a gate’s temperature. But you can
Djackdau t1_iuhdwzq wrote
Reply to comment by Fortune_Silver in ELI5 How did knights participate in tournaments like jousting without killing themselves? by QuantumHamster
You didn't even need to unhorse the other guy (which would also be quite dangerous). Most of the time it was enough simply to properly break your lance upon their armor.
a4techkeyboard t1_iuhdqtr wrote
Reply to comment by RaijinOkami in ELI5 , What is the 'metaverse' , how does it work and why did it fail? by NorrlandErik
Gotta Watch 'Em All, Popupmon!
Terravash t1_iuhdmlo wrote
Reply to comment by KhaleesiDog in ELI5: Newton's third law by AppropriateFeeling44
Given the density of a standard wall (assumed concretish) vs a tennis ball, surely you'd be going smaller than a micrometer to measure flex.
ekkidee t1_iuhdm5u wrote
Reply to comment by _OBAFGKM_ in ELI5 On the first day of fall does the sun take the same route through the sky everywhere? by bringthelight2
It would seem that at the equator, on the equinox, the sun would indeed travel a line from due east to due west, directly overhead. Such a line would have no inclination and wouldn't be affected by Earth's tilt since the concepts of due east and due west are affected to the same degree.
breadcreature t1_iuhdkxh wrote
Reply to comment by agretsukko79 in ELI5 How did knights participate in tournaments like jousting without killing themselves? by QuantumHamster
From what I've read there was also a lot of resistance to every advancement in safety measures, the danger was seen as part of the prestige and thrill. Some of the big (deadly) accidents thatve happened in F1 are fucking horrifying
RaijinOkami t1_iuhdkw5 wrote
Reply to comment by a4techkeyboard in ELI5 , What is the 'metaverse' , how does it work and why did it fail? by NorrlandErik
Alright, calm down, cyberpunk Satan, we don't need Digimon Adventure meets Ready Player One
labdog t1_iuhdiuk wrote
Reply to comment by GrumpyOldLadyTech in eli5 - If our cells only turn a certain amount of times before we die. Does causing micro damage from resistance training shorten our lifespan? by aus_ben93
And what about mechanical damage? Like various scratches and cuts? Are those dangerous? I know, I don't die from a stupid scratch or cut, but if it happens quite often, does it increase the risk of cancer?
Elcondivido t1_iuhdhuf wrote
Reply to comment by TonyR600 in ELI5 How did knights participate in tournaments like jousting without killing themselves? by QuantumHamster
I'm sure that something like that could have happened, but is pretty hard to hide the fact that you are pointing your very lon sticks way too high in front of an hundred of people.
Jousting stick are long, you can't really change the direction at the last moment to be sneaky.
RaijinOkami t1_iuhdh4f wrote
One good reason (one version of) the Metaverse failed is cause apparently no one seemed to realize that NOBODY is gonna spend 18 hours a day wearing a VR headset that is JUST heavy enough to possibly kink your neck and only lasts MAYBE 3 hours on a charge to live in a VIRTUAL mansion while getting ham-fisted for rent in the real world
vferrero14 t1_iuhdfjw wrote
Reply to comment by DonaldTrumpTinyHands in ELI5: How exactly do we get some much power from engine now, than we did 40, 50, 60 years ago? by Micromashington
It's also simpler and weighs less, especially a V8 with double overhead setup. The four cylinder overhead cam isn't as bad cause you just have two instead of any V config will have 4 cam shafts. Weight can effect fuel economy and simple (pushrods) always has its own benefits.
[deleted] t1_iuhdedl wrote
Helmut1642 t1_iuhdd8x wrote
Reply to ELI5 How did knights participate in tournaments like jousting without killing themselves? by QuantumHamster
Why, apart from their job was fighting in wars and jousts was good training but it was also a way to make a lot of money! many jousts with big melees or massed fights in teams allowed opponents to be captured and ransomed. Even if that was not allowed there were often valuable prizes and for unknown knights and those without a holding it was a good way to show good you were making it possible to gain a position in great lords household. So knights went from poor landless knights to in one case the Marshall of England, based mainly on his fame and wealth from jousting.
bringthelight2 OP t1_iuhenfu wrote
Reply to comment by _OBAFGKM_ in ELI5 On the first day of fall does the sun take the same route through the sky everywhere? by bringthelight2
Ok so this means on the north pole the sun would appear to move “slower” as it would still take 12 hours to go from Southeast to Southwest, as opposed to the equator where it’s going from one far side to the other.