How many molecules per cubic centimeter can a person smell?

There are individual differences. The lowest olfactory concentration that a person's sensory organs are able to smell is called the olfactory domain and is measured in terms of concentration (mass fraction).

The sensitivity of the human sense of smell is very large, and it is usually measured by the olfactory threshold. The olfactory threshold is the minimum concentration of odorous substances that can cause the sense of smell.

When measuring a person's olfactory group with the smell of artificial musk, it can be smelled in a liter of air containing 5e-10 mg of musk; When using mercaptans, people can smell such trace amounts of 4e-10 mg.

For the olfactory sensitivity of the same odor substance, different people have great differences, and some people even lack the olfactory ability that ordinary people have, we usually call it olfactory blindness. Even the same person, olfactory acuity varies greatly from one situation to another. For example, some diseases have a great impact on the sense of smell, colds and rhinitis can reduce the sensitivity of the sense of smell.

Significant changes in temperature, humidity, and air pressure in the environment also have a great impact on the sensitivity of smell.

Olfactory sense of smell.

Answer: One cubic centimeter = 1 milliliter = liter contains x molecules

of 23 square pieces.

x = 20 squares

x=18 squares.

Under standard conditions (0 degrees Celsius, 101 kPa), 1 cubic centimeter of air molecules = 23 to the 23rd power) = 19 to the 19th power

It takes about 90 billion billion seconds to count 3 in one second, about 311 trillion days, or about 864 billion years.

There are 10 trillion molecules in 1 cubic centimeter, and if you ignore all the factors that hinder counting, it will take 1 year and 7 months to count at a uniform speed of two per second!

This one has to do with people.

It is also related to the type of gas molecules.

But the ability of people to facilitate many odor molecules reaches the ug level.

1 cm3 of water is 1 gram, the molar mass of water is 18 g mol, and 1 gram of water is 1 18 mol

One mole of water is about one molecule of water.

1765 (Year) FYI.

The main thing is the diffusion of molecules with the help of the power of the wind.

Molecular diffusion role definition.

Diffusion is a basic way of mass transfer due to the diffusion of molecules and the thermal motion of atoms caused by the thermal movement of molecules and atoms. Diffusion driven by concentration difference, that is, the migration of material components from high concentration to low concentration area, is the most common diffusion phenomenon in nature and engineering. Diffusion driven by temperature difference is called thermal diffusion; Diffusion that occurs under the action of external forces such as electric and magnetic fields is called forced diffusion.

In chemical production, the diffusion of substances in a large enough space driven by the concentration difference is the most common, and the general molecular diffusion refers to this diffusion, which is the physical basis of the mass transfer separation process and also occupies an important position in chemical reaction engineering. In addition, the diffusion of fluids in porous media is often encountered, and its diffusion rate sometimes controls the rate of the entire process, such as the rate of some gas-solid phase reaction processes. Thermal diffusion is only used in the separation of stable isotopes and special materials, and forced diffusion is rarely used.

Diffusion is temperature-dependent.

According to the theory of molecular motion, molecules are moving at high speed all the time, and when the energy of motion is higher than the binding force between molecules, the molecules are separated from the object itself, and some will fly to the nose and be smelled.

1 mole of water is 18 grams, 1 mole is the source of 23 molecules, and 1 cubic centimeter of water has one water molecule.

6 billion 6x10 9 years.

1 mole of water is.

18 grams of bai, 18 cubic centimeters in the standard state.

Mole is multiplied by *10 23 cents, so 1 cubic centimeter of water has a moisture weight. One year = 365 * 24 * 3600 seconds. square (365*24*3600*10*6000000000)=, almost 10,000 years.

The number of water molecules per cubic centimeter of water.

is 18= pcs=pcs.

6,000,000,000,000 times 10 3,600 seconds 24 hours 365 days = 189216 10 13

So the number of years to be counted is A13) = 17675 years.

Under standard conditions (0 degrees Celsius, 101 kPa), 1 cubic centimeter of air molecules = 23 to the power of 19 (pcs) = 19 to the power of a second (3) takes about 90 billion billion seconds, about 311 trillion days, or about 864 billion years.