Why is it a bad idea to blow cold air from a fan on yourself while exercising?
474786
I never heard it was bad, my walking machine has a fan built in and it helps me go further. I think when you're that hot, a fan wouldn't take the core temp down enough to hurt the muscles.
587509
you did right, the fan built in the power supply takes the hot air out, the fan you changed should bring cool air in. Good thinking, logical always wins? Don't pay attention to "jerks" who answer your questions.
561759
cools the muscles down
549316
I have asthma, and I love air conditioning!  I like to breath the cool air better than warm.  It can't be too cold, though.  That's not good.
888312
I should think not.  People have been known to exert themselves when they are sick and their cold has gone into pneumonia.  Your body needs rest to fight off the illness.
861849
The fan on your desk takes energy in the form of electricity out of the wall socket. At the motor this energy is transformed into rotational kinetic energy that moves the shaft and the fan blades around. The shape of the fan blades cutting through the still air transfers energy into the air to make it move also.\n\nThere are more energy transfers taking place when that moving air hits your face and makes you feel cooooool.
605559
It does heat up the room, but it has two other effects: the constant stream of relatively dry air it evaporates moisture from your skin faster. Also conduction.  If the air and you are still, the air right next to your skin will be a bit warmer than the air further away, because it is colliding with your warm skin and takes some heat from you, but warms up in the process.  Cooler air blowing past will conduct heat from your skin more efficiently.\n\nThe molecules in water move at a variety of speeds. The "average" speed determines the temperature (it isn't exactly an average, but sort of is) but some move faster and some mover slower.  The faster ones escape and go flying into the room, and that brings the "average" energy of the water left a down a bit. This is why when you are wet after bathing, a humid room feels MUCH warmer than a dry room that is the same temperature; water molecules in the air stick to your skin just as often as the quick ones leave.  In a dry room this does not happen so the net effect is the higher energy (faster) water molecules leave preferentially and what is left is a bit cooler.\n\nIf the air is still, you end up with a bit more water in the air right next to, kind of like being in a humid room.\n\nThe second reason, increased conduction is similar, except the air is warmer right next to your skin because air molecules near your skin tend to collide with the ones IN your skin.  The ones in your skin, being a bit warmer, tend to lose energy to the air.  It cools, and the air warms, BUT conduction is more efficient when the temperature difference is larger. So, once the air next to you warms up a bit, you lose heat energy more slowly. Now, if you have a breeze, there is a steady supply of cooler-than-next-to-your-skin air coming in contact with your skin, so the cooling rate is larger.\n\nYou are correct that the fan will on average heat the room up more, but your body may end up cooler.\n\nThis reminds me of people who sit in front of the refrigerator with the door open on a hot day.  You might feel cooler, but the inefficiency of the fridge compressor means more heat goes into the room than the room is cooled off, but you, being right next to the fridge will be cooler perhaps than otherwise.
513566
It means that you left the computer running for too long or that it needs a break because it is overheating since you used it for so long. It is better for the oomputer to have a fan that blows really hard, since that would help stop overheating of your computer.
255934
Good question.  When you blow out, it is hot because it is your body temperature.  I think it's cool when you put your lips together first because you take a breath in, usually, before blowing out, thus pulling in cooler air.
643724
You should feel the fan blowing out from the power supply.
457072
The cooling effect is caused by the air or water removing heat from your skin. The water being much more dense, can and does remove much more heat than air. If the water and your hand are stationary, your hand will eventually heat up the water touching your hand and then it will feel warmer. As soon as you move your hand the cooler water will be felt again. This is where Chill Factor can be explained also.  As the wind speed increases the fresher cold air removes more heat from the skin making it "feel" colder.
105609
I would and used to. I have good luck with having a cool breeze blowing on my face and concentrating on the feeling. I can put myself into a trance while listening to the hum of the fan. You really need to clear your mind and feel free and peaceful. Can I help?
160386
It's not a matter of cold air moving toward warm air, but a matter of the air trying to find equilibrium. Cold air is denser than warm air, and cold air sinks while warm air rises. That's why we feel wind - the colder air rushes in to fill in the less dense air and create an equilibrium.\n\nThis may not be the most meteorologically correct explanation, so any weather people are free to enhance or correct it.
1029754
Yes, exercise is fine in moderation during this time. Just be aware of the possibility of heavy flow due to it and your protection not being sufficient. In other words check yourself to prevent embarrassment.
330387
Well sure! Just know that even though it may seem like a great idea, taking a cold shower after working out as a quick cool-down method can be harmful to your body. The raised body heat coming in contact with the cold water can put your muscles into shock. You'll be at greater risk for strains and other nasty issues like charley horses as soon as you step out! Lukewarm water and your favorite body products should do the trick to wind down after a strenuous workout!
301612
The air flow that is being prevented is not the air flow over the hole you blow across. By holding down the keys or covering the hole passed where you blow to make sound, you are preventing the air from flowing out that way. When you do that you make a tone different holes, different tones. By making tones you play music. Thus you play by preventing the airflow thought selected holes.
1011862
What does the fan do? Make the air move to cool down hot skin?