When you breathe out of  your mouth its called breath... what is it called when you breathe out  your nose?
549228
A rythmic expulsion of carbon dioxide which aids in maintaining the proper pH balance in the bloodstream in order to maintain life.
1064539
yes, yes and NO.  Due to low concentration of oxygen in our lung blood, oxygen passes thru thin cell walls into blood.  Due to higher concentration of Carbon Dioxide in our blood, it passes into the air in our lungs and is expelled.  Each exhale has less oxygen and more carbon dioxide than the inhale breath.\n\nHowever, there is still plenty of oxygen left, not all passes into our blood.  That is why mouth to mouth resuscitation works.  Plenty of oxygen in our exhaled breath to help with someone Else's inhaled breath.
1088139
mabey you have bad breath? :)
519475
You are inhaling the molecules of the substance. They fit into receptor sites in the nose; are transmitted to the brain area responsible for receiving and decoding them and are interpreted as smell. This is simply put.
1150092
When you hyperventilate, you breathe out excess carbon dioxide.\n\nWhen you breath out excess carbon dioxide, the pH of your blood gets affected (it becomes more basic).\n\nBy breathing into a paper bag, you breath the lost carbon dioxide back into your system, thus preventing a severe disruption in your blood's pH.\n\n-random physician
205885
breathe through ur nose...
978419
alkalosis.  Hyperventilation is breathing off the acid.
580243
breathe through your nose. don't open too wide
389371
Breath through your nose. In for 3s and out for 3s.
234288
That is called the "Filtrum"  This may sound a bit disgusting, but it is there to prevent matter from your nose, from entering in to your mouth.  It deflects the "matter" off to the sides.
918457
It closes off the glottis (opening) when you hold your breath.
574231
Sneezing is a reflex that occurs when something irritates the mucus membrane in our nose. Particulate matter, bacteria, and other such things get bogged down in the mucus and tiny hair-like cilia wiggle the potentially hazardous material toward the front of the nose or down the back of the throat. A message is sent to the brainstem, which sends messages all over the body. What happens next?…that great spasmodic reflex we call sneezing, a well-coordinated effort of many muscles working at once…your diaphragm muscle flexes, as do your abdominal muscles, your chest muscles, the muscles controlling the vocal cords, and the muscles in the back of your throat…your tongue raises to block your mouth…and your eyelids close. Air is forced out of your nose, sending thousands of bacteria-filled globules of snot into our immediate atmosphere…and then, as good manners dictate…people will invoke higher powers to bestow upon you a blessing. A most sanctimonious event, indeed!
341106
it's called the process of diffusion. as a smell spreads out its molecules use the air molecules to move away as gas molecules are so free. soon there is very little atoms of the fart smell left that it is unsmellable to the human nose although it's never truly gone!
504140
Very scientific.  I am a MAD SCIENTIST!  Keep your mouth shut when you are breathing....use yer nostrilz.  If you get too much air in your lungz, your body wants to force it eventually.  Practice deep breathing through your nostrils - it will relax you also.
673716
I agree with rocketman.  However if what you are talking about is when exhaling slowly your mouth is wide open (like when you warm your hands) vs blowing fast when you purse your lips (like blowing on your soup to cool it) then it is due to the expansion of the air, after it is adiabatically compressed by passing thru your puckered lips, which causes it to cool down.
55234
I pinch my nostrils closed, with my mouth closed of course, and try to exhale through my nose. Not hard though, not like you're trying to blow your nose.
16017
Sneeze is an involuntary violent expiration of air through the nose and mouth. It results from stimulation of the nervous system in the nose, causing sudden contraction of the muscles of expiration. The stimulus can include any irritating factor in the nose—inflammation of the tissues as the result of a cold or infection, allergic irritants (hay fever), or irritating substances such as dust or pollutants in the air. An occasional sneeze usually has little significance. Repeated sneezing indicates that some condition of the nose or in the immediate atmosphere requires attention.