Questions tagged [air]

Earth's atmosphere is a layer of gases that surround it, permitting life and protecting life by absorbing ultraviolet solar radiation, warming the surface by retaining the heat and mitigating the temperature difference between day and night.

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9 views

Can you remove air bubbles from oil by heating it just like you do with water? Does oil even have dissolved air?

I have a flat bottle filled half with water and top half with oil. It has a impeller connected with motor which slowly swirls oil and water to create beautiful lava lamp like effect. However after ...
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High flow, low pressure to low flow high pressure

I have a low pressure compressor (6 bar) and would like to charge a tank to a high pressure (150 bar). is there a mechanical device or physical process that can use the mechanical work of a low ...
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Thermal power station powered by temperature difference between high and low altitude air

Would it be feasible to build a system where warm air from sea level is pumped to the top of a mountain to power a thermal power station? With a lapse rate of ~ 1°C / 100 m there should be plenty of ...
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Equation to find the velocity of gas

Air travels from a hot place to a cold place. Is there an equation that shows the relation between velocity of gas (specifically air) and difference of temperature between two points?
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Does indoor odor smell travel up or down?

Does odor smell, let's say it's from caulk off-gasing, travel upward or downward in the air? Are all odor smell lighter than air?
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Calculation of dry air density without relative humidity

I would like to estimate the density of dry air at different temperatures and constant pressure (1 bar) just using the densities of nitrogen (79%) and oxygen (21%). I consider the number of other ...
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Would lotion pumps work in a vacuum?

I'm just trying to understand how a lotion pump works. I watched this video and it's explained that it's due to the difference in air pressure. https://www.youtube.com/watch?v=EJVL5zXIPLA&...
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Ventilation - Push system into Pull system, what can happen [closed]

this is my first question so please go easy on me. I have a system where it pulls air out of a sealed box at ~500l/min (this sealed box has a requested pressure of 10Pa, in case it is relevant). The ...
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At what speed would a wind affect a bullet? [closed]

Firing a gun loaded with the fastest bullet (.220 Swift 1,422m/s or any bullet that is super fast and excellent aero dynamics) in a close range (2cm) from the tip of an air blower. What would be the ...
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Does the amount of oxygen in air, actually get lower as you go to higher altitudes?

I have heard that there is less oxygen as you go higher (that's what my teacher told me). A reason that supports that is, as you go to higher altitudes, it becomes more and more difficult to breathe. ...
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How does a virus fall down in static air?

If we drop a virus from a height, in static air, will it fall to the ground like a lead ball, a balloon, or like a virus? How will it fall to the bottom? Like a Brownian particle? It will not float ...
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Could super-heated gas allow for Dirigibles/Zeppelins/Balloons to go higher than 60 km of altitude?

Well, I don't know much about physics in general, so I hope I don't make too many misconceptions. So, from what I could read in this Wikipedia article, the balloon named "BU60-1" achieved ...
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Flattening a sealed bag in space

Let's say you're in space, and you have an empty, sealed, round bag in space (full of "nothing" since there's no air). Is it possible to flatten the bag without unsealing it? My ...
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What actually happening in land breeze?

From childhood we are taught about land breeze and sea breeze , but I always had a doubt. Look at diagram Book just say " air above ocean become warm so it rise up creating a low pressure zone ...
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What is the relationship between air temperature and updraft velocity?

So I was playing Zelda Breath Of The Wild recently. And in the game, you can set grass on fire to create an updraft. (see the gif below) Which led me to ask myself : "Wait, how hot are these ...
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Is rising air high pressure or low pressure?

I keep hearing people saying that air rises because it is low pressure and that's what causes clouds to be formed. But, isn't hot, rising air high pressure? It's got fast moving atoms in it and that ...
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What is cold wind?

As per my understanding, temperature is the movement of particles in an environment. A highly energetic environment where particles possess high energy has a high temperature, and low energy means low ...
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Why is air considered to rise adiabatically?

Do air parcels not push against other air and do work on them? When air molecules within an air parcel bump into air molecules outside the air parcel do they not transfer energy to them?
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Why doesn't a hot air balloon burst even if we keep heating the air in balloon for a long time , shouldn't the air pressure become so high to resist?

I don't get one thing: we say a hot air balloon rises as hot air is less dense than cooler air. However, if the heat source continues to add heat to the air in the balloon, doesn't the hot air become ...
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Are air particles massless? [closed]

so as the question suggests, I wanna know whether an air particle has mass or no. Thank you!
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How to find at what rate of air flow the pressure in the system is maintained?

I have a pump that is pumping air into a vessel that has an inlet and an outlet. I have the experimental values for the point where the flow rate maintains the pressure but I can't figure out how to ...
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Why is the force due to a vacuum in a syringe so much greater than the force due to the air being compressed in the syringe?

I'm a teacher using a plastic syringe (no needle) to demonstrate the compressibility of air and the incompressibility of water. Works great, they can push the plunger in while blocking the end of the ...
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Will Air pockets replenish oxygen?

Assume I am stuck in an underwater cave that has an air pocket. I stayed there for a couple of days and got rescued just with very little oxygen. Will the oxygen replenish in the cave? Do we have any ...
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When and how was it 'concluded' that there is no air in space?

When was it confirmed/concluded that there is definitely not air in space? And how was the conclusion reached? We see the discussion of 'ether' before Special Theory Of Relativity and there it seems ...
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Can a dehumidifier reducing household energy consumption? Debunk this claim [closed]

I have recently bought a dehumidifier to control humidity in the winter, prevent mould and stop windows steaming up. Claims of reduced heating cost I noticed when looking what to buy, that some claim ...
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Heating air inside a drum to raise pressure [closed]

Hi and thanks for adding me. I have a complicated question! I hope it's not too complicated for someone out there to help me! So here's the situation. I work in pharma and we supply drums to customers ...
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Air and Empty Space

Dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases Which means if I were to take a differential volume dV of air, at any instant of ...
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Does a tire deflate more quickly when not in use and why? [closed]

Answers from a google support the obvious; that tires goes flat when not in use, but when you read the answers carefully they allude more to that - yes a tire can still go flat when not used. My ...
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Calculate venturi effect for equilibrating pressure drop

Let me first say I am a novice in fluid dynamics, I am not sure about terminology but I will try to explain myself as clearly as possible. I need some help for understanding the following case: in a ...
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Understanding Convectional Rainfall

Consider the following explanation of convectional rainfall given in a VII grade textbook. When air comes in contact with the hot surface of the earth, it gets heated, becomes light and rises in the ...
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What's the best way to orient the bathroom door to optimize fart fan efficiency?

When using a fart fan I often close the bathroom door to around a 10° angle. I have no real idea why except for this strange notion that limiting the fresh air intake might increase air pressure and ...
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Pressure Gradient in Astronaut’s Centrifuge?

Status is no progress yet Intro Recent questions mentioned pressure gradients in a box. If you weigh a box in a vacuum, the gas contributes its weight with a pressure gradient inside the box. If you ...
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How can I select the best fan blade for my application [closed]

I am working to build a large 12v fan with the goal of generating the strongest "breeze" possible. I began with a radiator fan pulled from a car, and quickly learned that while this ...
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Air pressure inside a room

I have an apartment with quite good sealing on the windows. Due to no window in the bathroom, there is a constant ventilation going on, sucking air from the bathroom (an therefore the apartment). ...
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Why isn't water thermal capacity used to easly cool the air in a room?

Why isn't water thermal capacity used to easly cool the air in a room? Would it be energetically cheap to use cold water as a room air cooler and when the water temperature reaches some limit it is ...
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Vapor Pressure in Heated Pressure Vessel

This question is a bit complex, so thanks in advance for addressing it! I'm working on a reaction vessel that heats a water solution to 95°C to perform chemical reactions. The design is a ...
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What is the counter-force to suction force?

I've been thinking about air pressure and vacuums recently and a (for me at least) interesting question came to mind: If there is an area with lower pressure than the surrounding air, the air ...
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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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Will a contained fluid and a fixed, perfectly consistent source of disturbance eventually settle into a pattern, or will it be chaotic?

Imagine you have a large room, which is completely sealed, and a cordless fan in the corner that constantly blows at a low speed. Disregarding effects like heat transfer from outside, minute physical ...
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Water profile under effect of acoustic pressure (fluidostatic)

I was wondering how to calculate the profile of the water when it is subjected to a focus acoustic wave propagating in air. In particular, let's assume that an acoustic wave is propagating in air and ...
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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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Air conditioner cooling capacity vs air flow rate and output air temperature

I have a Sinclair AMC-15A portable single-unit air conditioner. It's specifications state the following: Cooling power: 4.4kW Inside air flow rate: 420m3/h (max.) This seemingly defies (my ...
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How do sound waves cause air molecules to oscillate?

I would like to clear up some confusion about the mechanics of air particles that are propagating a sound wave. I understand that there is no net movement of air molecules when a sound wave passes ...
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Pressure at the base of an air column 6371 km high

If you allow me some imagination, without laughing, then I can assume that I dug a very vertical hole, come on, let's say 1 m2 of section to fix the ideas, which crosses the Earth through its center, ...
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Non-popping bubbles

I used a compressed air can to clean my laptop's keyboard and speakers. After that procedure I noticed there're small bubbles in the holes of the speakers. I've tried to pop them with a thin brush and ...
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Does "wind speed" depend on the density of air?

Our intuitive notion of "wind speed" is that it is the speed at which air molecules are moving at point. Consider two situations where the velocity of the air molecules are the same but the ...
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Room Pressure and Tiny Gaps

First of all, how can atmospheric pressure be same in a closed room when it clearly depend on the height of the air column. Compared to atmosphere, the room few metres high so how can air pressure be ...
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What if speed of air exceeds 340m/s?

We know that Mach cones are formed when an object moves faster than the speed of sound. This creates huge noise in the surroundings. Here the airplane is moving faster than sound relative to ...
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How high would a half deflated ballon float outside of a third floor?

this a question that has been haunting me for many years now. If I have a half deflated helium baloon that floats one meter above the ground on a third floor and I take it outside, will it float one ...
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Could a hot-air balloon fly if the temperature outside is hotter than inside?

If a hot-air balloon was approaching an active volcano where the air temperature outside was presumably much hotter than the air inside the balloon itself, would it start to fall into the volcano or ...

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