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The most active metal must be carefully stored to keep them from reacting violently to what in the air?
water vapor
What happens when air is humid?
Humidity (relative) is the amount of water vapor in the air, expressed as a percentage of the maximum amount that the air could hold at the given temperature; the ratio of the actual water vapor pressure to the saturation vapor pressure. So pretty much the air is moist and heavy.
What does it mean for the relative humidity of an air mass to be 70 percent?
Let's do a quick review of some facts about water vapor in air, and then we'll tackle this question. An air mass will have a given temperature and a given pressure. For air of a given temperature and pressure, only a certain amount of water vapor can be "suspended" in that air before it begins to condense and precipitate out (as rain, snow or something else). When the amount of water vapor in the air is at it maximum (for whatever temperature and pressure we cite), that air has 100% of the water vapor in it that it can hold. Any more water vapor and water will condense and precipitate out, as we stated. That's all we need to know to take on this question.When we consider the amount of water vapor in a given air mass, we use a "standard" or and "index" to relate that amount of water vapor to something "fixed" to make our measurement. The reference in this case will be the maximum amount of water vapor that an air mass can hold at that temperature and pressure (whatever they are). In the case of this question, if the relative humidity of an air mass is 70%, that air mass (whatever its temperature and pressure) is holding 70% of the water vapor that it can possibly hold. Note that term we use is relative humidity. The "amount" of humidity in an air mass that has a relative humidity of 70% is 7/10ths (70%) of the amount of water vapor that it can possibly hold altogether. We've compared the amount of water vapor in the air to the maximum amount of vapor that it can hold.While it is true that an air mass may have this or that temperature and pressure, in any given air mass of whatever temperature and pressure, there is some maximum amount of water vapor that it can hold, and when we look at the amount of water vapor in that air mass, we compare it to that maximum amount that it can hold. That's relatively humidity, and when relative humidity reaches 100%, that air is saturated with water vapor and we can expect it to begin to precipitate out in the form of rain or another form of precipitation (depending on temperature and conditions aloft).It might help to note that warmer air and air at higher pressure can hold relatively more water vapor that cooler, less "pressurized" (less dense) air. But whatever the temperature and pressure of an air mass, there is some maximum amount of water vapor that it can hold, and we look at how much is in it, and compare that to the maximum amount, and call the comparison the relative humidity.
What humidity is the measure of the in the air?
Water vapor.
What happens to air pressure when water vapor increases?
Atmospheric pressure is reduced with increasing water vapor because the water has a lower molecular weight than dry air. The same number of molecules occupy a given volume at a given pressure, so the total mass of water vapor laden air is lower than dry air. If you add up the weight of a column of the wet air it will weigh less than the same column filled with dry air, hence, wet air has a lower air pressure.
What is water vapor in air?
Water vapor in the air is water in the form of a gas.
How does water vapor enter the air?
Water vapor enters the air as water at the surface evaporates or as plants transpire water vapor from their leaves.
When it's humid the air holds a lot of water vapor but when it's cold what happens to the water vapor?
nothing "happens" 2 the water vapor. the vast amount of water vapor in the air on a humid day as exactly bcoz its so hot. the water is drawn out of sources which holds it. but when its cold that water isn't drawn out
When water vapor is added to the air the density of the air is?
When water vapor is added to the air, the density of the air decreases. This is because water vapor molecules are less dense than dry air molecules.
What happens to the water vaper in the air when the air cools?
When air cools, it can no longer hold as much water vapor, so some of the water vapor might condense into liquid water droplets. This can lead to the formation of clouds or fog.
How does temperature affect amount of vapor in the air?
The warmer the temperature, the more water vapor in the air. The colder the temperature, the less water vapor in the air.
What is the relationship between water vapor and humidity?
Water vapor is water is gas form. Humdity is the amount of water the air can hold. So, they're both water in the air.
What is water in the air?
water vapor
A measure of the amount of water vapor in the air is?
Relative humidity is a measure of the amount of water vapor in the air. It represents the ratio of the amount of water vapor present in the air to the maximum amount of water vapor the air can hold at a specific temperature, expressed as a percentage.
Why is there a limit on the amount of water vapor the air can hold?
It takes a lot of energy to turn water into water vapor. The amount of energy that the water gains to turn into water vapor begins to be transferred into the surrounding air. If the air is willing to take on more energy the water vapor condenses quicker. This is why hot air will hold more water vapor than cold air.
Which is more dense air saturated with water vapor or air unsaturated with water vapor?
Saturated air is more dense.
What does relative humidity described about air?
Its ratio of the air's water vapor content to its water vapor capacity :)
