Questions tagged [humidity]

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How much humidity value underwater?

Stumbled upon this question this morning. Yet couldn't find the answer on google If humidity is defined as ratio of water (vapor) content in air, what value will it show if we put the sensor ...
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1 answer
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Does water evaporate more quickly from ocean if air is cold or hot?

If a colder air mass blows over warmer ocean water, does evaporation of water happen quicker than earlier when the air was warmer?
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21 views

feeling humidity - absolute vs relative

I m trying to understand whether it is absolute humidity (how much moisture in the air) or relative humidity (percentage to total saturation) reflects how humid we feel. In most places i searched the ...
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0 answers
10 views

Humidity gradient above saturated salt solution

I have an enclosed container with about 20 cm air above a saturated Magnesium Chloride solution (about 150cm^2 surface). It has been sitting undisturbed in relative constant temperature (~19.5-20.5°C) ...
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2 votes
2 answers
60 views

Is it better to line dry inside or outside a house? [closed]

On a winter night (so no radiation from the sun), my house is 10°C warmer than outside. Both temperatures are above freezing. I measured the humidity and found out it to be the same both outside and ...
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1 answer
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Mystifying Relative Humidity - That can't be accurate?

While humidifying a room in my home, measuring the Temperature and Relative Humidity (T&RH respectively) every 8 hours, I noticed that RH rises and falls with T when it should be the inverse. I ...
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0 answers
28 views

Temperature-Humidity-Wind (THW) index for hot and cold weather [duplicate]

Does anyone know the formula (or the algorithm, even a fortran code) to calculate the Temperature-Humidity-Wind (THW) index not from the heat index but in general? (someone published a (too simple?) ...
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1 vote
0 answers
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If I maintain air temperature in a room, but allow humidity to vary, will room objects remain at the same temperature?

Let's say I have a room with a HVAC system and I'm trying to keep objects in the room at a constant body temperature. My HVAC system maintains a constant air temperature, but the relative humidity in ...
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2 answers
72 views

Why i feel cool when near a lot of trees although it absorb heat from environment still it make environment humid ALSO? [duplicate]

Why I feel cool in a region with lot of trees inspite of humidity by transporation? Today I went for a walk and entered a region with lot of trees, It feel a sudden chill, a cool feeling (...
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0 votes
1 answer
63 views

What actually we mean when we say "reaching 100% relative humidity and no further evaporation"?

What do we mean by reaching 100% relative humidity? Is that we reach the utmost vapor pressure at that particular temperature of liquid? Or something else. If I have 2 half filled water bottle, in one ...
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2 votes
1 answer
53 views

Why I feel cool in a region with lot of trees inspite of humidity by transporation?

Today I went for a walk and entered a region with lot of trees, It feel a sudden chill, a cool feeling (comparatively) Why, Although trees perform transpiration that cause moisture so we should feel ...
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Accidental Gas Measurements in a Temperature Humidity Chamber reveal weird CO2 behavior

Accidental gas concentration measurements inside a temperature humidity chamber revealed the gas concentration levels inside the chamber changed significantly from known ambient atmospheric gas ...
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0 answers
263 views

Mollier diagram and reading the relative humidity when knowing the dry- and wet bulb temperatures

I had a thought error when reading Mollier diagrams and thankfully we have the internet to assist, but even after finding the correct sources showing the answers, I can't get out of my thought-loop to ...
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0 votes
2 answers
112 views

How is it possible to calculate the water content of air in liters ( from relative humidity and temperature )?

My home has 150 m3 air. I would like to calculate, that how much liters of water this air contains, if the temperature is 25 C° and the relative humidity is 60%. I would like to calculate it for 26 C° ...
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1 vote
1 answer
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How they work: dehumidifier vs air conditioner

From what I understand both dehumidifiers and air conditioners do the same thing. They blow air onto cooled pipes. This means that dehumidifiers must cool the air and air conditioners must dehumidify ...
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1 vote
2 answers
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How do we cool exactly as sweat evaporates from our skins?

We all know that when our sweat evaporates to the air we feel colder, but since this process is a latent heat transfer our body temperature will not change, then if our body temperature is constant ...
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-1 votes
2 answers
77 views

What is the effect of atmospheric pressure on the vapour pressure of water?

This question relates to a planned test simulating cold, humid air flowing inside a cold pipe at altitude and measuring the ice that is formed inside the pipe. I have a value from: https://courses....
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0 votes
1 answer
39 views

What is the RH of blown air effect?

From xto 2 is a dehumidification process to an air inside an air conditioner. This process will sure give you air with low moisture content which will let you feel dry air. But also this air holds a ...
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2 votes
1 answer
24 views

Air Conditioners Proccess

When using cooling with dehumidification process sometimes the relative humidity increases, my question is that won't the blown air effect your skin by humidity due to this increase in relative ...
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0 votes
2 answers
152 views

Relative humidity at different temperatures misconception

People in hot arid deserts often look at the weather report and find out the RH is 20%. Then they say it's 20% in a warm tropical country, so we're in just as humid a place as that! Doesn't a RH of 20%...
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How to maintain moisture on a substrate?

I know that different materials absorb water differently and dry differently. The simplest example is when washing clothes and putting them in the dryer they take different amounts of time to ...
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2 votes
1 answer
34 views

How exactly does air accommodate water vapor?

I would like to have clarity on how air accommodates water. When water vaporises, does the water molecules just squeeze into the space between already existing molecules of nitrogen and oxygen? From ...
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4 votes
1 answer
378 views

What does 'saturated' air actually mean?

I'm having some problem in getting an insight on what 'saturation with vapor' actually means. The question is asked in the context of atmospheric air becoming saturated with water vapor and beginning ...
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2 votes
0 answers
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Coffee quality and temperature

The question is about adjusting the size of particles of coffee powder to temperature. It is said that properly grinding the coffee grains is cricual for making good coffee (I have an espresso ...
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0 votes
1 answer
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Can someone point me in the right direction about isothermal compression process

I am reading book about compressors and I have a question about isothermal process and water condensation. Is it true that during actual compression process water vapor will condense? I was always ...
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3 votes
4 answers
448 views

Doubts related to speed of sound in different mediums

since childhood we have been taught that sound travels faster in solid (most dense) as compared to liquids (less dense). and speed of sound is greater in liquids as compared to gases (least dense), ...
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6 votes
2 answers
1k views

Why do fireproof safes "capture and hold in moisture"?

From The Best Fireproof Document Safe | Reviews by Wirecutter: Humidity can be an issue with these safes, as they tend to capture and hold in moisture, which can damage their contents. Someone ...
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1 vote
1 answer
99 views

Why adding fan to dry cabinet not improve dry performance? [closed]

My dry cabinet is basically rubber sealed cabinet with peltier module to condense moisture and drain it out. The drying process run quit slow from ambient humidity around 50% to 70% it take about 3 ...
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2 answers
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How can the moisture of a peace of wood can be reduced to below 10% if the surrounding air humidity is over 50%

This question just came to my mind and I hope this is the right Stack Exchange to ask it. How can the moisture of a peace of wood can be reduced to below 10% by storing it outside surrounded by air ...
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1 answer
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Calculating indoor humidity -- do I need to account for pressure?

I'm developing a calculation that converts an outdoor temperature, pressure and relative humidity into an indoor relative humidity (for a given indoor temperature). E.g. if it's 39°F outdoors at 87% ...
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0 votes
1 answer
134 views

Why does humidity helps keeping heat?

When I turn on the AC to heat my living room, it usually takes a long time, but when I also boil some water in the kitchen(The rooms are connected), the living room heats very quickly. I ran a small ...
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0 votes
2 answers
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Relative Humidity Problem

I have been assigned to solve the problem: the ongoing temperature of the room $T_1 = 7$; RH is 85% and I am asked to figure out how much the temperature must be increased in order that RH would drop ...
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2 votes
1 answer
67 views

What spreads faster - temperature or relative humidity?

Let's say you open a window. There is difference in temperature and relative humidity between inside and outside air. Which room quantity will equalize faster with the outside - temperature or ...
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2 votes
1 answer
51 views

What might cause water vapor to move against the flow of air in an enclosed space?

I have a rectangular tent that I'm planning to use as a mushroom fruiting chamber. It measures approximately 120 x 60 x 150 cm and has two duct fans installed--an intake fan near the top of the left ...
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0 votes
1 answer
56 views

How can I calculate vapor pressure from temperature and relative humidity?

I have a datalogger that records temperature and relative humidity in a room. Can I use that to calculate vapor pressure?
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0 votes
1 answer
264 views

Calculation of humidity ratio by vapor partial pressure

I've been looking around for a way to calculate the humidity ratio by the partial vapor pressure and the atmospheric pressure of the environment. I found a procedure for such calculation on ...
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1 vote
1 answer
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How does the temperature and humidity of air affect the water consumption of a humidifier?

We can model the water consumption $\dot{m}_{w}$ of a simple humidifier using the following equations: \begin{align} \eta_{hum} & = {T_{db,i} - T_{db,o} \over T_{db,i} - T_{wb,i}} \\ h_{o} & = ...
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1 vote
2 answers
1k views

How to calculate Water Vapor Pressure?

So, we know that $$\text{Relative Humidity(%)}=\frac{\text{Actual Water Vapor Pressure}}{\text{Saturation Vapor Pressure}}$$ Now, we can find saturation vapor pressure only from the ambient ...
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0 votes
1 answer
415 views

How exactly does a (capacitive) humidity sensor work?

How exactly does a humidity sensor work? For example, how can it differentiate between a relative humidity of 30 % and 35 %? I know how a capacitance works but for me that principle is way too high ...
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2 votes
0 answers
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How does humidity affect the dielectric constant of a material?

I'm trying to figure out how a humidity sensor using a Capacitor works, and every document I have managed to find seems to come to the conclusion that an increase in humidity causes the capacitance to ...
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0 votes
0 answers
41 views

Quickest way to dry wet floor

I have spilled around one liter of water to wooden floor. I'm afraid wood will deform and pop out. What would be quickest way to dry it? I have wiped out what I could, but some water passed between ...
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2 votes
2 answers
411 views

Why is cold air drier than warm air?

I know this has been asked before but i could not understand the replies. If someone has a simpler answer please do so. My simple Geog lesson just said that warm air molecules are further apart ...
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1 vote
1 answer
163 views

Relative humidity problem: definition of specific volume in terms of kg dry air

I'm working on a thermodynamics problem which is as follows: "Saturated humid air at 200 kPa and 15C is heated to 30C as it flows through a 4-cm diameter pipe with a velocity of 20 m/s. Disregarding ...
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1 vote
1 answer
82 views

How to calculate moisture content from relative humidity values?

I want to know the soil moisture content. However, these moisture probes are expenive. Instead, I have a relative humidity data logger that I want to use for the soil experiment. How can I obtain the ...
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0 votes
1 answer
84 views

To calculate the dewpoint ºC increase in a compressed air line

Good afternoon, I am really not a physics guy but I am trying to calculate the effect that pressure has in the dewpoint value. So I have a machine that refrigerates atmospheric air and dries it. ...
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-1 votes
1 answer
42 views

How does a shower contribute to the humidity inside a bathroom?

I would like to know the exact process behind the humidity in a bathroom increasing due to a hot/cold shower.
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1 vote
0 answers
20 views

What's the speed of change of the relative humidity of air inside a greenhouse [closed]

The propagation speed of air humidity is an important variable affecting climate and sanity inside a greenhouse. High relative humidity of internal air is a typical phenomenon of many greenhouses ...
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0 votes
0 answers
56 views

Does heating an air permeable container affect the dew point inside it?

I know that the dew point is only affected by pressure and amount of water in the air so temperature should not affect it. However, I was wondering about a situation where there was a container with ...
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17 votes
1 answer
271 views

Why does pepper not stick to the glass with print inside my pepper shaker?

So I have this pepper shaker made of glass with a print on it: One fine dinner, it ran out of pepper, so I opened the lid to fill it up and noticed a peculiar thing – small particles of pepper dust ...
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1 vote
2 answers
152 views

Moisture diffusion in air

Moist air is less dense than dry air. Additionally hot air is less dense than cold air. If we have moist hot air packets above dry cold air packets. How can the mixture of these air layers be ...
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