Why does blowing on food make it cooler? Our breath is warm already.Blow related.
Our breath contains CO2, which, although it is a greenhouse gas, also reflects radiation of many kinds. The concentration of CO2 in our breath allows heat from the food to be reflected out, but is not high enough to produce the "greenhouse effect" commonly known to happen in the Earth's atmosphere.
It's cooler than the food. Thermal equilibrium must be attained.
Like all science, cooked food is full of sin. By blowing on it you chase away the demons (who are warm, from being in hell).
>>512278You're a moron.
>>512301>>512278>>512268All morans. Obviously the food gets cooler because Jesus wills it so.
blowing scatters the hot air around the food and replaces it with slightly warm air from our breaththe warm air is still colder than the hot food, so heat spreads away from it more quickly
>>512322Quit trolling.
>>512299No John you are the demons
>>512268Fuck no.On topic: We assume you're blowing on the burger because its too hot for you, in which the burger's temperature is higher than yours.by you blowing on it with your body's temperature breath, the heat from the burger flows into the gas and dissipates this is how we see the steam from it. The Law of Conservation of Energy proves this. That heat only flows in one direction, from hot to cold, where cold is just a lack of energy, its not its own category.
>>512250why do an electric fan makes you cooler--even in warm weather?
>>512250Because we blow away H20 molecules around it (de-humidifying the air around the food), allowing more water to evaporate from food faster, which leads to faster heat loss.
Blowing on food makes it hotter. The geometry of the air molecules makes it abrasive, and when the molecules scrub against food, it creates energy, which in turn heats the food.
>>512341>We assume you're blowing on the burger because its too hot for you, in which the burger's temperature is higher than yours.What? Did you fail out of high school? We don't perceive things as hot because they're hotter than us. About 80 degrees is when things begin to feel "too hot" for us, which is way below our average body temperature of 93.A burger's average temperature never gets above 90. This is why it is too hot.
>>512329Quit being retarded.
>>512344Its the same principal used for Lift on airplanes.The faster the gas moves, the less dense it is, and the less energy it contains until you hit the negative where friction takes over, and creates heat because of the gas molecules colliding with your skin.
>>512359
>>512359you cannot create energy, you must leave with the same amount you started.
>>512374I meant that it converts the energy within the air into heat energy.
>>512360You genuine shit. If something has the same temperature as you, you don't feel any temperature difference. So yes, hot things are hot relative to how hot we are. Tea is close to boiling temperature, hot food is up to 60 degrees celsius when you eat it, etcFucking noob
>>512347>>512365Both of these are true. /thread
>>512360no, then when it gets over 100 degrees near the equator, do people just burn because its too hot? No.a Burger, which we assume is made of meat of some sort, is required by USDA law to be cooked to a temperature of 140 degrees Fahrenheittherefore the burger is hotter than a human
>>512360>About 80 degrees is when things begin to feel "too hot" for us, which is way below our average body temperature of 93.and this is why you feel a burning pain when you touch other people
>>512396LoL'd
>>512396>>512392>>512386He's talking celsius. When our 90C temp bodies touch 80C temp things, it hurts us.
>>512396>implying skin is the same temperature as the core of the body.
>>512406>>512407>implying we're all just boiling water underneath skin.
>>512344expanding gas coolssame principle as your refrigerator
>>512407>implying that isn't the exact point I was making given that the core temperature is irrelevant to the discussion
>>51240690 degrees C is 194 degrees Fahrenheit
Seriously, stop using Fahrenheit, it's retarded.
Food is wet, blowing allows "dry air" to run over the wet food where water evaporates. Evaporation absorbs heat. This combined with the fact that its exposing the burger to room temperature (or body temp) air. Since the air around the burger is relatively static until blowing which creates a hot pocket of air on its surface which doesn't allow for quick cooling until the air is circulating properly.
>>512423>implying burgers are wet>bread is dry you moran
FFS why does no-one in /sci/ have even the slightest grasp on basic scientific prinicples. Everyone in this thread needs to learn about the effect of temperature gradients on cooling.
i like how everyone assumes that breathing in room temperature air and storing it in your lung for five or so seconds automatically makes the air soar up to 98 degrees when you breathe it out
>>512432Humans are like cars.
>>512428Bread still contains water.
>>512423>Food is wet, blowing allows "dry air" to run over the wet food where water evaporates.Yeah, my burger is always really soggy when it comes out of the microwave. God, you idiot.And "dry air"? Do you know how many water molecules are in human breath?
temperature is just a measurement of energy
>>512449this is why we see our breath in winter.
>>512449>my burger is always really soggy.It is. That's why it steams. You know. Steam.
>>512464Steam is caused by the vaporization of starches in food, not by water.
Blowing does nothing.You're just leaving it to cool, instead of eating it straight away.
>>512471lol?
>>512471
my god you are stupid.lrn2 Bernoulli principle
>>512471starches are solid.they must be mixed with an aqueous solution to vaporize, and even then its like getting the salt out of water, the sale remains while the water rises.
>>512456>>512449You guys are complete niggers obviously our breath has water in it but when you blow on something unless your right next to it your also pushing a lot of "room air" in front of your breath. If you want to be a douche and argue that the air hitting the burger is highly saturated with water then it has a even greater cooling effect as the mist of your breath evaporates slightly in the air and is then cooler by the time it hits the food. This is the reason misters feel cool in the summer. Its hot out but the mist is evaporating slightly as it flows through the air.The most important thing is simply air circulating. The air around the burger is hot and stagnant which acts like an insulator. (why a fan keeps you cool)
The same reason a heatsink works.
>>512406You mean 37 degree bodies. FFFFFFUUUUUUUUUUUU
Does everyone here know that gas reducing in pressure lowers the temperature? If so, it should be obvious.
Placebo effect, the food actually gets hotter.
tl;dr, a lot of morons.According to Dick Feynman [see: Six Easy Pieces], vapor coming off of the hot food is being blown away, thus taking energy out of the system. Vapors form endothermically, and liquefy exothermically.If the food were left in an ideal closed vacuum, the food wood exist at some dynamic equilibrium with particles jumping in and out of the food at the same rate, leaving it at a constant temperature.
