Air Definition and 1000 Threads

I have an application where I must calculate the venting flowrate of air required due to temperature change when hot tank is rinsed with cool water. The tank has spray nozzles inside so it can be cleaned in place. For the properties of the air in the tank I used the CoolProps module in Python...

VOC = volatile organic compound These are gasses that evaporate into the air from common every day products (solids and liquids) around us, from furniture and carpet, all the way to cosmetics and cleaning products - and more. They are everywhere in the environment, but can sometimes build up...

I'm surprised that I'm getting this wrong. Seems like everything checks out in my calculation. Correct answer is supposedly C.

Got a friend with a boat he's storing over the winter. He wants to discoruage misture and mold build up by keeping air circulating. He puts a box fan in the companionway, (and presumably opens the fore hatch). All other things being equal, is it better to point the fan into the companionway...

Hi. If we wanna train inside a water pool like just play fighting, how much depth that we need to simulate an altitude at 16000-18000 feet? Thank you.

Hey everyone, I had an idea for making an aluminum air battery that mitigates some of the problems. The draft is quite rough but I just made it now and I can improve it as I go along. So basically the idea is the aluminum will cut up into large grains/pellets in a fuel tank. The pellets will...

Last night I head a very odd hum. I believe it was atmospheric, but did not see the source. It was at 10PM It came from the north. It did not noticeably move. It was about 250 Hz. It was not a perfect sine wave - there was some distortion. More or less like an engine. It lasted about 4 minutes...

It’s been said that an air compressor could be “idealized” as a reversible adiabatic process in which case calculating the properties of the gas at the exit would be simple. The problem is, it rarely seems to be the case, in practice, that the process is reversible so how useful is this...

Part a) Is fairly trivial, just multiply both the given numbers to find the total change in momentum per second, which by Newtons II/III law is the thrust produced. Part d) is confusing me a great deal. I agree that pressure/density of air will decrease with altitude, this means that there will...

Hi, We have tried to create various models of a "pingpong ball launcher" that works on a burst of air from a standard compressor. Each version we tried to build results in the pingpong ball spinning inside the tube instead of launching out of the tube (bernoulli ?) We varied the air pressure...

from ... www.physicsclassroom.com/class/1DKin/Lesson-5/The-Big-Misconception "Free-fall is the motion of objects that move under the sole influence of gravity; free-falling objects do not encounter air resistance. Huh ?? of course it encounters air resistance, doesnt it ? An object...

my answer = F = 1.6*9.81 - 1.2*9.81 = 3.924 N -> resultant force of the drone moving (weight minus the upward force) M= 1.2kg , mass of drone a= 3.31 m/s^2 , acceleration of drone u=0 m/s , initial speed of drone t=1s , time v = 3.27 m/s, final speed of drone and its not even in the options... 😶

Hi. Since I've been studying fluid mechanics, I've been asking a lot of questions Thank you all for your help! I suddenly have a problem that I want to think about while studying today. I would like to know the change of air volume according to the pipe shape as shown in the picture below...

Hello I need your help studying hydrodynamics. I have a question about the volume of air. Assuming incompressibility, non-viscosity, there is a coefficient of tube friction, and it moves in laminar flow... The Oulet stage Fan is installed, so air moves from top to bottom. The cross-sectional...

Hi - I built an air cannon to launch a fishing lure for my science fair project. The air cannon launched a 1/4 oz lure 31.4 meters. Based on this, I calculated the initial velocity to be 17.54 m/s using the formula for range of a projectile. I want to be able to launch the lure 38.5 meters. I am...

Hello. I ask nothing here from a long time ago. One of my students is doing research on how to cool the air in a room without using any electrical or mechanical devices. For example: using just ice. What we need is how to solve/describe the process using math. For example: how to use/solve the...

I've been trying to find the formula(s) to determine the flow rate of air (and properties) in a pipe of varying diameters connecting two theoretical reservoirs of infinite size. The pipe is short in length so friction can be neglected. Reservoir 1 is always a higher pressure. There is no heat...

And this is the Cv graph for hydrogen: I think the Cv graph for air is similar with this graph. But I don't know the answer, can someone tell me?

For now, I just searched online for some kind of application relevant to the problem posed

Im trying to figure out if I were to have two points with 10cm of humid ocean air between them and a fly or mosquitoes flew between the points, if they would get zapped and create an electrical arc, or if the bug would act as an insulator and be avoided by the arc? also, could the bug trigger...

When I woke up today in the morning, I had the stupid idea of trying to remember some of my knowledge from university. As it turned out, this was easier thought than done, especially given my still drowsy state of mind. I want to roughly estimate the penetration depth of visible light in air...

Hello Actually, I'd like to find the effect of different Equivalence Ratios on my gasification experiment using plastic waste as feedstock fuel but I'm confused as to how I can find the Equivalence Ratio because I don't know the exact chemical formula of plastic waste I'm using. So I'm curious...

I'm interested in the very basics of drag, both for ships in water and airplanes in air. Here's what I have so far : Flow of the medium can be laminar or turbulent. As the relative speed of the vessel increases, the more likely the flow is to be turbulent. Laminar drag increases linearly...

In a recent thread, I thought I understood what was going on but alas, I am still confused. So I offer this diagram and ask for more help please. Shown is an aircraft holding pattern. The one on the left is flown in still air. The one on the right is flown with a wind coming from the...

• I exhale 1 kg of CO2 per 24 hours = 41.67g/h (average) • Co2 indoors after ventilation = outdoors = 400 ppm (world average) • Co2 indoors threshold = 1000 ppm (cognitive effect) • Room volume = 32.5 m3 • Details to neglect: window and door closed tight, no HVAC system or other ventilation...

Is my solution correct? (I only have answers to odd-numbered exercises.) Is it a good solution or have I overcomplicated things? (a) The forward force provided by the engine balances the air resistance force, so ##F_{engine}=F_{air} = \alpha v^2 + \beta /v{^2}##. Let ##W_{engine}## be the...

Hello guys :)In the frame of finding a physical model for the temperature of Earth's surface, talking about the very "idealized" two-layers model of atmosphere, I ask you now the question to the other physicists or engineers: does it make sens to associate an emissivity to a layer of air (+ some...

How do I go about the calculations for an air conveyor that has the same working principle as an air hockey table? The conveyor should not he bulky seeing as it is a prototype. Please help me.

Let's consider an uncovered glass. Air particles are present in the glass. $$ P_1 = P_a$$ $$P_2 =P_1 +\rho gh = P_a +\rho g h$$where ##P_A## is atmospheric pressuere and ##\rho ## is air density. Now, if I cover the glass with a plastic card, then what is ## P_1##? $$P_2 =P_1 +\rho gh $$ 1)...

If I have a air tank that is 1 cubic feet with the pressure gauge at 0 and I pump in air to 5000 psi how many cubic feet of a 100 psi would be in that tank? Any help would be appreciated

Looking at the given values, I thought the specific heat formula could be used to calculate the final temperature of the air: c = Q/mΔT. Since the final temperature is the sum of the initial temperature and the change in temperature, the formula can be rearranged to ΔT = Q/m*c. Q = 30 W * 10 s...

Wikipedia — Carbon sequestration claims that burying charcoal into the soil offsets CO2 and thus reduces the greenhouse effect: Is it a must to cover charcoal/biochar with the soil to prevent the air and rain water exposure to avoid oxidation, i.e. offset carbon dioxide? Would it otherwise...

What approximate portion of generated heat from being active on the treadmill, both the person on it as well as the machines themselves would be compensated/cooled if the treadmill resistances would be disabled/removed and instead 1/2 end cylinders would be connected to an air conditioner...

I have a cube with a volume of 1000m3 at an initial temp of 290K. The bottom side (10m by 10m) is open to the ambient air. I put this cube into a huge fridge and cool the whole volume by 5K. I close the open side by placing a cover on it. This cube has now got a volume of air at a temperature of...

I have a situation that I cannot explain so I need the assistance of someone with a good understanding of thermodynamics. I have 36 AC to DC power supplies located in an equipment rack. These power supplies are failing after some time. The failures appear to be moisture related. We put...

Hi I currently subscribe to Directv, the signal is from the dish and split into 4 coax to go to 4 different rooms. So each room has a coax output on the wall to hook up to the Directv receiver box. I decided to change to Dish Network. At the same time, I want to install a VHF/UHF digital tv...

Can someone please answer this question, so I can figure who is wrong here, me or author. Thank you.1.question (picture below): empty epruvete turned upside down is dipped in glass filled with water to the depth H. While doing that water enters the epruvete and reaches height of h. The AIR...

I have been reading about the Ranke-Hilsch vortex tube. Details of the explanation tend to differ somewhat among different sources, but it got me thinking about the following thought experiment. Air enters a tube of about 0.5 x 4 cm cross section. It passes through a section that is channelized...

For part(a), The solution is, However, I made a mistake somewhere in my working below and I'm not sure what it is. Does anybody please know? Thank you! Here is a not too scale diagram at the moment of the collision, ## \vec L = \vec r \times \vec p ## ## \vec L = -y_{com}\hat j \times...

Is it possible to create (nearly?) laminar flow in a tube with rectangular C.S. , around 1 cm X 5 cm , with air moving at around 100 to 150 m/sec? Turbulence will likely set in sooner or later, but can the laminar flow be made to last over say 20 cm?

Hi there, I'm working on a project where my aim is to detect the presence of PFAS (Per- and poly-fluoroalkyl substances) in air samples gathered by a system. I've done a ton of research, but most solutions are unachievable due to price and the available space (the system should be relatively...

Last winter I built a corsi-rosenthal box filter to help clean air in the house, I built it 5 sides with 20"x20" merv 13 rated filters. I was impressed with how well it worked, and am implementing two of them this winter. We have 2 dogs & 2 cats so pet dander as well as dust can build up a lot...

I found a box of air core solenoids and was hoping someone could me think of a useful lab to use them for. They are about 700 turns each. They carry 7 to 10 amps. However I think I think I would only be able to provide 3 amps because of the power supplies I have. I would like to use them to do...

Hello, I was creating a device to move water up a tube using air pressure, but I am not certain how much pressure I would need. I attempted to create it using 5 gallon buckets, however I was unable to apply the needed pressure needed to the airtight container. The image below is what I have...

The other day I read on a website that a lower evaporator airflow causes lower low pressure side saturation temperatures and higher delta T on an air-conditioner. Now I think I know why a lower evaporator airflow would cause a high delta T. If there is less air moving over the evaporator, the...

I'm using a stainless steel pan and a fan to cool my coffee down as quickly as possible. Usually, I have the fan blowing down towards the coffee, but this morning I flipped it over to suck the heat out of the coffee and I'm wondering which of the two is the most efficient, especially as, in the...

Looking for some guidance in calculating pressure of air pocket in pressurized water column. Example: 2" vertical pipe, capped, with 2" of air and 40 psi water applied.

I expected this to be challenging but it's turning out to be much harder than I expected. I just flew back from Cuba to Toronto, got in at 315AM. It was a beautiful, clear and I had the window seat, so I took a bunch of pics. Now I'm plotting the flight path by analyzing the photos. It's super...

Hi everyone, I'm an electrical engineer working on making a linear model for a power take-off system. I've gotten inertial, friction, and hydraulic/electric components done, but what is really confusing me is the gas system; I haven't taken ANY thermodynamics. To simplify it, it is modeled as a...