why are most fragrance molecules small?
86530
Graham's law states that the effusion of a gas is inversely proportional to its molar mass. Smaller molecules are able to move through the air faster and make it to your nose in large enough numbers for your nose to detect them. Your nose is not particularly strong, too.
914014
its called a flehmen response it helps smelling certain substances. See link for info so I don't have to write it all here.
882835
Probably carbon latice structures, like buckeyballs or nanotubes.  These could then contain the smaller compounds that are doing the desired work.
164558
Well then all your questions should be answered by the American Society of perfumers\n\nhttp://www.perfumers.org/faq/
12571
there are lots of devices that "smell," like the ones we use for natural gas, CO, nitrogen sulfide, etc.. i guess it depends on what you are trying to smell..
72779
A molecule is made up of atoms.
914477
Certain spirits do have certain scents. If they wore perfume in life, then when they appear, it will smell like perfume. If they smoked a lot of cigars, then the smell of cigars will appear when they do. Its called an impression, which is what the spirit leaves behind.
310638
I guess you need to use a phtse transfer catalyst (PTC). Since most of the perfumes contains alcohols, you can give a try using alcohol as PTC.\n\nJust dissolve your perfume in MINIMUM amount of methanol/ethanol. And then add water to it.... \nFor most of the cases this will work!\n\nGood Luck!
854736
Sometimes they do. You can tell if a perfume is "bad" by it's smell. Some lose their scent and some get a really strong odor. I found some perfume/cologne (didn't know which as the label was in German). It's packaging looked like it was probably purchased in the 1960's, maybe early 1970's. It's smell was a very strong, pungent alcohol smell. The small roll on that was with it smelled okay. So maybe packaging has something to do with it also.
846092
If you mean the biology term "active transport" I can answer...\n\nCell fluids have stuff dissolved in them like oxygen, nutrients, salt and different ions, etc... The concentration of this stuff inside the cell usually must be equal to the concentration of the stuff in the fluids outside the cells. "Dissolved Stuff" usually moves from areas of high concentration to areas of low concentration to balance out the amounts in both areas. \n\nThink of opening a bottle of perfume in a room. Gradually the scented molecules of perfume make their way around the room and, if given a long enough time, fill the room to an equal concentration. You could tell by observing that the smell of the perfume would be more or less the same strength everywhere in the room.\n\nWell, this process is diffusion- movement of fluid (in this case, perfume and air molecules) from high concentration ( the bottle) to low concentration (the room).\n\nActive transport is the opposite in many ways- it is the movement of fluid from low to high concentration. Sort of like putting the perfume smell back in the bottle. You might realize that this is not the natural tendency for things and you'd be right. Acitive transport is "active", requiring energy and or specialized cell structures to happen. \n\nDiffusion and active transport take place through semi-permeable membranes in plant and animal cell structures- sort of like a layer of plastic with very very very tiny holes poked in it that allow only certain sized molecules to get through.\n\nHope this helps!
1062906
I've read that the smell of suntan lotion is one of the sexiest fragrances, universally.\n\nIt probably reminds us of having less clothes on and more fun because of it!!
809824
If the concentration of the reactants is equal, it will be A. The smallest
788216
Smell is based on the nose detecting the presence of molecules. If the smell is coming from an object there must be molecules coming from it. Whether that results in a loss of mass depends on how they are being released.\n\nIf the smell is from molecules on the surface of the object just floating free into the air, then yes it does lose that mass.\n\nIf the smell is due to molecules being released in a chemical reaction with the air or other surrounding substance, then the reaction *may* actually add to the object's net mass. Or it might not. It depends on the nature of the particular reaction.\n\nIn most cases I'd think it would be just molecules floating free so it would lose mass.
854950
In general, it should be small atoms, because smaller atoms have less electron orbitals. Also, in smaller atoms there are less electrons and this means that the shielding effect is lessened. Thus the negatively-charged electrons are closer to the positive nucleus, and the attraction is stronger.
1077307
not all of them..\n\nH2O, CH3CL, CH3COONa are weak.. (also any organic substance eg. CH3COOH)\nNaOH, KF are categorized as strong ones due to the formation of ionic bond bet. them, + they're inorganic..
96753
I wore that REALM pheromone perfume for a while years ago.  It didn't really seem to be so powerful.  It smelled good but the guys weren't flocking towards me.  \n\nI think pheromones are more for animals.  For us, it is just a marketing ploy.
347112
No.  Not really.\n\nThe scent molecules emit from the flower every second, whether you are sniffing them or not.  Sniffing will keep the air circulating, which will bring them off faster, but the difference will probably be minimal.