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Most people who have not studied physics or chemistry is hard to believe that the moist air is lighter, what is saturated steam or less dense, than dry air. How does the air become lighter if we add moisture to it?
Scientists have known this for a long time. The first is Isaac Newton, who stated that the moist air is less dense than dry air in 1717 in his book, Optics. However, other scientists generally do not understand this until the end of the century.
To see why humid air is less dense than dry air, we need to switch to one of the natural laws of the Italian physicist Amadeo Avogadro discovered in the early 1800s. In simple terms, he found that the volume of gas that remains, say one cubic meter, at the same temperature and pressure, will always have the same number of molecules what is saturated steam no matter what gas in the container.
Most beginning chemistry books explain how this bekerja.Bayangkan one cubic perfectly dry air. It contains approximately 78% nitrogen molecules, each of which has a molecular weight of 28 (2 atoms with atomic weight what is saturated steam 14) .Other 21% of air is oxygen, with each molecule what is saturated steam has a molecular weight of 32 (2 stoms with atomic weight 16). One percent of the end is a mixture of other gases, which we are not going to worry about.
Molecules are free to move in and out of our air cubic feet. What Avogadro found leads us to conclude that if we add the water vapor molecules into the air we cubic feet, some nitrogen and oxygen molecules what is saturated steam will leave - remember, the number of molecules in cubic feet of air we remain the same.
Water molecules, which replaces nitrogen or oxygen, has a molecular weight of 18. (One of oxygen atoms with an atomic weight of 16, and two each hudrogen atoms with atomic weight 1). It is lighter than both nitrogen and oksigen.Dengan other words, replacing oxygen with nitrogen and water vapor loss in cubic feet of air, ie, the density decreases.
Wait a minute, you might say, "I know water is heavier than air." True, liquid water is heavier, or more dense, than the air. But, the water that makes the moist air is not liquid. This is water vapor, which is a gas that is lighter than nitrogen or oxygen.
Two of the most dominant component in the dry air of Oxygen and Nitrogen. Oxygen has an atomic mass unit 16 and the nitrogen atom has a mass of 14 units. Since both of these elements in the air diatomic - O 2 and N 2, the molecular mass of oxygen is 32 and the molecular mass of nitrogen is 28. Steam
Water vapor - H 2 O - consisting of one oxygen atom and two hydrogen atoms. Hydrogen is the lightest what is saturated steam element in one atomic unit, while oxygen is 16 atomic units. So the water vapor atom has an atomic mass of 18 atomic units. With 18 units of water vapor atoms lighter than diatomic oxygen with 32 units and diatomic nitrogen with 28 units.
0.7809
0.000018
28.97
October 7, 2012 at 12:43 pm
Recent Posts Differences Downbursts and Tornado AIR MASS MOVEMENT Front Description Did you know dry air is heavier than air wet MATH Archives November 2012 May 2012 November 2011 October 2011 Categories Sky Midshipman Follow Blog via Email
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Most people who have not studied physics or chemistry is hard to believe that the moist air is lighter, what is saturated steam or less dense, than dry air. How does the air become lighter if we add moisture to it?
Scientists have known this for a long time. The first is Isaac Newton, who stated that the moist air is less dense than dry air in 1717 in his book, Optics. However, other scientists generally do not understand this until the end of the century.
To see why humid air is less dense than dry air, we need to switch to one of the natural laws of the Italian physicist Amadeo Avogadro discovered in the early 1800s. In simple terms, he found that the volume of gas that remains, say one cubic meter, at the same temperature and pressure, will always have the same number of molecules what is saturated steam no matter what gas in the container.
Most beginning chemistry books explain how this bekerja.Bayangkan one cubic perfectly dry air. It contains approximately 78% nitrogen molecules, each of which has a molecular weight of 28 (2 atoms with atomic weight what is saturated steam 14) .Other 21% of air is oxygen, with each molecule what is saturated steam has a molecular weight of 32 (2 stoms with atomic weight 16). One percent of the end is a mixture of other gases, which we are not going to worry about.
Molecules are free to move in and out of our air cubic feet. What Avogadro found leads us to conclude that if we add the water vapor molecules into the air we cubic feet, some nitrogen and oxygen molecules what is saturated steam will leave - remember, the number of molecules in cubic feet of air we remain the same.
Water molecules, which replaces nitrogen or oxygen, has a molecular weight of 18. (One of oxygen atoms with an atomic weight of 16, and two each hudrogen atoms with atomic weight 1). It is lighter than both nitrogen and oksigen.Dengan other words, replacing oxygen with nitrogen and water vapor loss in cubic feet of air, ie, the density decreases.
Wait a minute, you might say, "I know water is heavier than air." True, liquid water is heavier, or more dense, than the air. But, the water that makes the moist air is not liquid. This is water vapor, which is a gas that is lighter than nitrogen or oxygen.
Two of the most dominant component in the dry air of Oxygen and Nitrogen. Oxygen has an atomic mass unit 16 and the nitrogen atom has a mass of 14 units. Since both of these elements in the air diatomic - O 2 and N 2, the molecular mass of oxygen is 32 and the molecular mass of nitrogen is 28. Steam
Water vapor - H 2 O - consisting of one oxygen atom and two hydrogen atoms. Hydrogen is the lightest what is saturated steam element in one atomic unit, while oxygen is 16 atomic units. So the water vapor atom has an atomic mass of 18 atomic units. With 18 units of water vapor atoms lighter than diatomic oxygen with 32 units and diatomic nitrogen with 28 units.
0.7809
0.000018
28.97
October 7, 2012 at 12:43 pm
Recent Posts Differences Downbursts and Tornado AIR MASS MOVEMENT Front Description Did you know dry air is heavier than air wet MATH Archives November 2012 May 2012 November 2011 October 2011 Categories Sky Midshipman Follow Blog via Email
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