# Questions tagged [gas]

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### How to predict out wavelength emitted from gasses

I'm trying to figure out which gas emits a specific wavelength when excited. Say I want to develop an LED that emits a certain wavelength. How would I figure out which gas emits that specific ...
2k views

### Is it possible to increase the heat output of a gas stove by connecting two gas supply canisters to it at the same time, and is it safe to do so?

Here's a typical outdoor gas stove: It is fed by a low-pressure gas supply in the form of a camping cartridge or via an LPG cylinder connected to a low-pressure regulator (around 30mbar) like this ...
29 views

### Can I calculate the amount (mol or mass) of water in a gas, in a heat exchanger, if I know the partial pressure of the water?

Is it possible to calculate the amount of water (mol, mass...) in a gas, in a heat exchanger, if I know the partial pressure of the water? The stream through the tubes is mainly benzene and ...
25 views

### What is the purpose of combustor in a gas turbine

I have read online that a gas turbine converts the chemical energy in the fuel gas to mechanical energy of the turbine blades. The way I see it, because of this hot air one would have to go for heat ...
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### Should pressure vessel head be thicker than wall [closed]

I wondering should the head of a rectangular pressure vessel cylinder be thicker than the wall ?
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### Determining required pressure drop for choked flow conditions to be met

I have pipework system with an inlet pressure, $P_0$, which passes from a pipeline of fixed diameter, $D_0$, through a tee with reducer to a smaller diameter pipe, $D_1$, before returning to another ...
17 views

### CO2 probe measuring at temperatures up to 150 °C

I'm looking for a $CO_2$ measuring probe (analog current output, digital out: RS232/485 - probe will be connected and transferring real time data to the data logger) that would operate up to 150 °C (...
45 views

### Does the shape of a car really matter for how much gasoline it drinks?

Let's say that we have a mid-1950s "gas guzzler". Now, we take away the exterior "shell"/chassis and replace it with a modern car's. That is, it will visually look just like a modern car from the ...
1k views

### How can I turn home gas (LPG) from liquid to gas?

"LPG" is the term used here for a mixture of Propane & Butane sold for public use. The exact ratio varies depending on where you buy it and I think also with the season and is not known to me. I ...
91 views

### Which type of sensors to analyze polluting gas from vehicle emissions

I am thinking to develop a remote-sensing applications for vehicle pollutions. In such cases generally expensive optical IR and UV devices are used because more precise. These devices are generally ...
528 views

### What are the differences between compressor stations, pump stations, and booster stations?

I am doing some research on impacts related to natural gas compressor stations. In some states, I've received data for compressor stations alongside other facilities in the oil and gas world. These ...
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### Is there a type of check valve that allows gas to flow in both direction but stops liquid from flowing back?

I have a pressure regulator to maintain a specified pressure in a vessel that also contains a liquid. The regulator can pressurize or relieve pressure of the vessel. I want to prevent the liquid from ...
13 views

### Determine gas orifice size based on factory sea level orifice (range oven)

I have a natural gas unit that is being used at a non sea level application. It comes with #36 orifice size, and gas is at 5"WC. With that information, how would one determine the proper orifice size ...
114 views

### Multi-gas barometric height formula in isotope separation devices?

What is the barometric height formula for a mixture of gases? The main problem I can see, the curves describing the minimal energy (kinetic + gravitational/centrifugal) won't be any more a simple ...
61 views

### Injecting CO$_2$ into water: how does injection work?

I've been wanting to design my own water carbonation device for a while. For reference, I've been looking at devices like the Sodastream, which injects pure CO$_2$ into water to dissolve it with up to ...
79 views

### Do pressurised cans still pose a risk to bursting in normal conditions, but after being exposed to heat?

We're planning on shipping some items from the US to Australia as you cannot get them here, that being: https://www.chewy.com/sentry-stop-that-noise-pheromone-dog/dp/56486 I have been in contact ...
27 views

### Valve/Filter allowing through gas only, no liquid

I need to devise a way to ensure only NG passes through a pipe, and no condensates or other liquids. It is ok to shut down the pipeline if liquids would be detected. The dimensions involved are small ...
89 views

### Classic Thermodynamics: Ideal gas question

The question is in the attached picture. I know how to solve the first part of the problem, but the second part confused me a lot. Now when the oven (system) is unsealed, doesn’t make that an open ...
19 views

### How to calculate the two parameters in the red box about Required ventilation rate and Calculated CO2-loss?

I dont know how to calculate the two parameters.I think The total energy of the light is 700w/m2*3600s=2520Kj,then I will not do it.
23 views

### What kind of sensors to be used to measure the carbon dioxyde concentration?

I'm planning a thought project for measuring the C02 in a room (at office namely), and communicating its results to a computer. But I'm blocked at the early stage: which sort of sensor and which is ...
60 views

### Ideal gas law, theory vs reality

I am trying to get an idea of the amount of hydrogen that I can store in some pressurized steel tanks underground. Based on the ideal gas law PV=nRT I did a simple calculation pressure = 200bar ...
1k views

### How to know whether the flow is supersonic in a nozzle?

For a project I had built a convergent divergent nozzle designed for Mach number = 3. In that project, I could know the flow has gone supersonic by seeing the manometer fixed between the throat and ...
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### Cheapest way to measure gas flow (mass)?

I understand that there are quite a few fairly simple and cheap methods to measure the flow of gas in terms of volume, allowing you to get a flow rate in terms of litres per minute for example. ...
17 views

### Parts needed for controlling vacuum line pressure with pressurized nitrogen

I'm trying to assemble a simple setup where a line which is typically under vacuum can be pressurized by an external nitrogen supply, with this pressure regulated to less than 1 bar absolute (let's ...
20 views

### How to contain air ions inside a chamber without loosing their charge?

I would like to create an experiment where I would hold ionized air molecules. Most likely negative O2-1 ions. I am looking for the most appropriate enclosure so that the ions do lose as little of ...
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### Programming a gas mass flow controller rig

I'm trying to upgrade a multiple gas flow controller, which must be capable of controlling the mass flowrates of three gases independently through one outlet line to our system, and am in need of a ...
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### Is there an optical technology able to measure the temperature of dry air?

Optical IR sensors are able to measure the surface temperature of solids. But is there a range of the EM spectrum that can accomplish the same for measuring the temperature of nitrox (dry nitrogen, ...
48 views

### Relationship heat rate with capacity

I am an economist, so please keep replies simple ;) I am searching for the relationship between heat rate and capacity for gas-fired power plants. Here is what I refer to as heat rate, i.e. the ...
188 views

### Determining pressures of a compressible gas

A friend and I wrote a paper for a fluids class discussing the details (as they relate to fluid dynamics) of constructing a cannon that could shoot a steak fast enough to cook it. We quickly ...
24 views

### Equation for temperature of gas at Joule-Thompson Inversion State

Assume that a gas obeys the following equation of state: $\nu = {\frac{RT}{P}}-{\frac{a}{T}} + b$ Where $a , b$ are constant. Derive an equation for the temperature at the Joule-Thompson ...
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### Oxygen sensors in trace gas environments

Do Oxygen lambda sensors (used in automotive applications) work in trace gas environments? My requirements for a trace Oxygen gas sensor: The sensor must be capable of working in an inert gas ...
87 views

### maximum capacity factors of combined cycle gas power plants

What is the maximum annual capacity factor that can be expected of a CCGT plant? I see in US in 2015 the average was about 0.56, but can it be higher? I guess it needs some time for maintenance but I ...
452 views

### What is a reference that i can use to find the interpretation of a symbol in a gas line schematic?

I have a schematic for some gas lines in a wafer processing unit. One of the symbols which occurs is a circle with an x in it that has the left and right quarters filled in to form two black ...
125 views

### Will natural gas or propane generators also run off of methane?

I'm looking at building a sustainable energy project that will convert biogas (methane) into electricity. I haven't found any biogas or methane electric generators for sale. It seems that there are ...
34 views

### Measuring gas flow from a low-output device

My lab uses a home-built biomedical instrument that acts as a ventilator for test-subjects. In other words: our device combines nitrogen and oxygen gases and pumps them down the line at a specified ...
695 views

### Lpg cylinder to compressed air tank

I am building a small robot having pneumatic system. I am using 12v car tyre inflator as my compressor.But i didn't find any 3ltr to 6ltr standardrd air tank. Can i convert my old 3ltr lpg tank into ...
78 views

### Why is gas pressure specified instead of mass flow?

Clarification: This question is all about the gas supply to the water heater. It has nothing to do with the water supply. My hot water heater specifies 5.5-10.5 W.C. (water column inches) of pressure....
87 views

### why doesn't soda go flat immediately after opening? [closed]

so, soda is under pressure and has gas dissolved in it. But, when you open it, the gas is still dissolved in it. But, if we wait a few hours, the gas has escaped into the atmosphere. What factors ...
44 views

### Can I improve this exhaust gas probe to be immune to pressure changes?

I'm designing a probe to provide a stable and continuous stream of exhaust gas sample to an analyser. The probe has to be inserted into the exhaust for about 20–30 cm to keep outside air from entering ...
51 views

### Is there any option other than a gas welder

I want to repair a dent in a piece of cast iron with brass. I want to fill the site with brass. For some reason, I want to do it by myself. I can buy an instrument for this work in a limited budget(...
240 views

### Can using different types of alcohol in a cloud chamber produce different particle tracks?

The design for a cloud chamber is rather simple, and many factors can be changed without producing different results. There is one curious point that I've stumbled upon, though: The type of alcohol ...
68 views

### Natural gas boiler Vs. Electric Heater efficiency

If a facility buys natural gas at 8 dollars/Mcf to provide heating from an 85% efficient natural gas boiler, what is the equivalent cost of electricity (\$/kWh) for a 95% efficient electric heater? I'...