Co2 Definition and 309 Threads

There are some magnet drop experiments in the literature and I want to try an alternative experiment to determine if the magnetic fields affect inertial mass. I am designing a submarine shaped enclosure where I will have either two 2"OD 1/4"ID 1"thick N42 magnets with their opposite poles...

Popular, lengthy article with many embedded links, which I have not followed. https://www.statnews.com/2024/06/04/co2-ventilation-research-virus-airborne-life-haddrell-celebs/ Research Article: Ambient carbon dioxide concentration correlates with SARS-CoV-2 aerostability and infection risk...

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• 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...

A shortage of carbon dioxide (CO2) in the U.S. is leading to complications at a number of breweries and food suppliers across the country. https://time.com/6215461/carbon-dioxide-beer-shortage/ Denbury Energy issued a statement that the contamination was a "minor issue", and they maintain...

Antarctica's only active volcano shows how CO2 allows volcanoes to form persistent lava lakes at the surface https://phys.org/news/2022-05-antarctica-volcano-co2-volcanoes-persistent.html

I was wondering if there is a method to measure the actual total mass of carbon dioxide (CO2) emitted from a diesel engine used with a generator for power generation (https://www.cat.com/en_US/products/new/power-systems/electric-power/diesel-generator-sets/1000028914.html). Infrared CO2 sensors...

I have a kid who wants to do a report on aerosols. As I understand, we have researched that for pepper spray devices liquid CO2 is used as a propellant, but we can't find out how they calculate the concentration. Is there a place we can find the right formulas needed?

At very high temperatures CO2 should have Cp = 15/2 R, since there are 3 translational, 2 rotational and 4 vibrational degrees of freedom. Experimental values are a bit higher than that, at least according to a figure I found on the internet. Is that correct? And what is the explanation? A...

Here it is specified that optimum operating temp for industrial C02 laser is within the range 59 °F to 77 °F. This is what is generally specified online, but it leads to a number of questions; How is this measured? Does it refer to the whole unit, or the point of emission of the beam, or some...

I read that a kg of gas provides about 13kWh (47.5MJ) of energy and that burning a kg of gas emits about 3.15 kg of CO2. So presumably a gas-powered engine emits 3.15/13 or about .242kg of CO2 per kWh of work, right? According to the EIA, the US electric grid emits about 0.85lb or 0.386kg of...

Scientists reported successful making of starch out of CO2. https://newatlas.com/science/artificial-synthesis-starch-from-co2/ Climate crisis averted?

Not trolling here, just have genuine confusion over CO2 levels comparied to what we believe CO2 levels have been historically and their effect on climate change. I recently saw some Facebook group infographic posts which claimed that CO2 concentration in the atmosphere is the lowest it has ever...

A container of 0.5l containing 6 moles of CO2 are heated to 200 ° C on is interested in explaining the pressure variations between the pressure of a perfect gas and the actual value measured on a pressure gauge. The coefficients of the real gas a=3.59 [atm l2/mol2-] b=0.0427 [l /mol] indicate...

The solution says that the concentration of CO2 is equal to the concentration of H2CO3, which can be used to solve the rest of the problem. Does CO2 turn completely into H2CO3 when dissolved in aqueous solution? Thanks.

would this be a quadradic equation since its dealing with half life? I think in 500/50 = 10 minutes, the fan would have brought 500 CF of fresh air, but the out fan would have been taking out the same amount of air which includes the fresh air, so at 10 minutes, it should have less then half the...

Hello fellow physicists, I need to calculate the rotational partition function for a CO2 molecule. I'm running into problems because I've found examples were they say this rotational partition function is: ##\zeta^r= \frac T {\sigma \theta_r} = \frac {2IkT} {\sigma \hbar^3}## Where...

How is this possible? I can't think of what could be absorbing Co2 inside my house, when I am producing it at a pretty high rate. I have my HVAC running on a frequent cycle mode also. I have no plants. The sensor...

My goal is to determine the ideal amount of air flow, in order to keep CO2 below 1000ppm and to minimize heat loss. I calculated the following based off a similar post in this forum, and I am hoping this can be verified so I know that i am in the right ballpark and going in the right direction...

I've made it through the first 2 parts, it's just that part C has me stumped. I don't know how to manipulate the information I already know to figure out the total work energy required by the compressor, ##W_{compressor}##, during the process.

Is the mechanism of greenhouse gases trapping energy emitted as Infra Red radiation by the cooling ground either reflecting back a 50% of the radiated IR energy back to Earth or/and the greenhouse gas molecule becoming excited with the extra energy and essentially becoming hotter? Is it just the...

The question is: If the compression ratio of car engines is increased by 10% (from 10 to 11), estimate the volume reduction in annual CO2 emission. Assume there are 30 million cars each consuming one cubic meter of fuel annually. The question is looking for a rough estimate for an answer. I...

Robert Boyle's law states that at constant temperature, the pressure of fixed amount ( i-e number of moles n) of gas varies inversely with its volume. Mathematically, it can be written as $p ∝ \frac1V $(at constant T and n) $\Rightarrow p = k_1 \times \frac1V $ where $k_1$is a proportionality...

Hi. As i understand from what i have read about supercritical CO2 loops a major hurdle is erosion of the materials. especially in the hottest zones of the loop and in thin material sections and zones where the fluid changes direction or expands/compresses. But from the experiments i have read...

Determine the total enthalpy of the reactants and the total enthalpy of the products. Record these values in Table C of the Student Worksheet. I need to know the total number of products and reactants in ∆Hf (kJ/mol) The substances are: C3H8+ 5 O2= 3 CO2 + 4 H2O please help me> please...

In the world of Origin of Life hypothesizing, there now seem to be two main competing approaches. Life originating at alkaline hydrothermal vents and an origin in intermittent terrestrial pools (exposed to periods of drying) getting outflow from volcanically heated water sources. The alkaline...

Absolute pressure is gauge pressure + atmos press Guage press = 1.29 bar G 1 bar = 10^5 Pa 1.29 bar = 129,000 Pa Atmos Pres = 1.01x10^5 Pa Absolute pressure = 230,000 Pa Henrys law: P=KhC 230000Pa = (116x10^3Pa)C 1.98 mole fraction =C 70% CO2 = 1.387 mole fraction 44g Co2 in 1 mole 61.07g...

Absolute pressure = Gauge press + Atmos press Atmos press = 105 Pa Co2 press = 0.1 bar g = 10000Pa Abs press = 10,105 Pa Hydrostatic pressure = absolute press + (density)(grav)(height at midpoint) = 10,105 + (1008)(9.81)(10) 10,8989.8 Pa Calc CO2 conc by henrys law P=KHC C=P/KH =...

This is a serious question, and it is not meant as an attempt to "debunk" greenhouse warming of the earth. Wikipedia has the below image, which shows the atmospheric transmittance as a function of wavelength. Notice the red vertical line through one of the CO2 absorption bands. We see that the...

If trees are cut and then burned they have not reduced the CO2 in the atmosphere at all. And if they are left in the forest and then rot 90% of their mass also go back into the atmosphere. Here in Germany we have many old salt mines. I wonder if it would be a good idea to cut trees and store...

BS EE and lifelong science lover. Love "predicting" things but its really just knowing science advances first. I'm curious about everything. Curiosity killed Schrodinger's cat.

I came across a few different articles and social media post that claim moss is far better at absorbing CO2 and other pollutants then trees. The article from the link below claims that a relatively small planter is the equivalent of 250 trees. Is this accurate? If it is, why isn't this more...

I didn't notice this forum section until just now, I noticed it as I was scrolling down to the general area to ask if anyone knew of a forum that deals with climate science. What ways can we detect CO2 in the atmosphere. I've seen some social media posts that show an image of South America that...

Hi all! This is my first question, i hope it does make sense :) I'm trying to find a way to isolate CO2 gas when doing electrolysis of a water solution with Na2CO3. I understand that i can do that with two half cells connected by a salt bridge, and i will get NaOH plus H2 gas in the cathode...

Hi, Can anyone guide me with an approach to find the liquid volume of CO2 when a gas of 4.14x10-6 m3 at -20°C and 1 bar is compressed to liquid at 25bar, without change in temperature?

Hi everybody I follow climate denier pages and every now and then come across a claim that doesn't seem to have been debunked yet. One such claim is made here: <link to uacceptable source deleted> The gist of the article is that scientists experimented with using different gases in double...

I have read oodles of hand wavy qualitative text about 'the greenhouse effect' and it is clearly dominated by the absorption characteristics of H2O vapour. What I struggle to understand is the part of CO2 in radiative absorption, in relative quantified terms. CO2 has absorption peaks at 2.7um...

I am a science hobbyist and working on a paper to illustrate the impact of CO2 on Global Warming. Question – What is the Storage Capacity in joules, of one molecule of CO2 @ 20c/68f/293k. In other words, what is the maximum amount of IR energy that one molecule of CO2 can store at this...

Mentor note: This thread started as side-discussion in the thread New Tokamak D Mode Success - Fusion is Almost Here, see there for earlier posts that lead to this discussion. I split the threads. Everything from post 2 to post 20 was moved, later posts were made here.

<Moderator's note: Moved from a homework forum.> Dear team, I wish to use CO2 to de-air a device by exploiting the physical properties of CO2 as a heavier, more dense gas to air and therefore displace air in a very thin tube that has a nozzle at the end where both air and CO2 can escape. I wish...

Climate rewind: Scientists turn carbon dioxide back into coal The article says that this process takes place using a liquid metal catalyst at room temperature and is both efficient and scalable. The rest of the article can be read over at phys.org (link in title). The published paper (open...

Homework Statement Solid sodium bicarbonate decompose when it's heated above 50 celsius. However, when it is dissolved in water interactions of components changes. So what happens when sodium hydrogen carbonate solution is heated? Does it release carbon dioxide when temperature is above 50...

So here's an interesting topic and I would appreciate some input from the assembled brains of PF to the question. Unfortunately I can't reveal the background to this but I want to know something about the rate that small bubbles of CO2 are likely to be dissolved in water under moderate pressure...

I just read the policy for this forum "Earth" so i hope my next question will be approved, it is with the best intentions. My friends and i where having a discussion about CO2 and the correlation with the raising temperature, we know that CO2 is a greenhouse gas. About that, CO2 is a greenhouse...

hi I am trying to find a free diagram of the CO2 absorption dip at 4.3 microns? I need it for interest purposes! Thanks.

Hi All, I am trying to find out how much CO2 (ppm) would be released into a ventilated room (m3) from a faulty pressurized gas cylinder to calculate risk associated. Would anyone be able to help me with a formula? I was trying to work with V=nRT/P but wasn't sure how do I translate the outcome...

My understanding is that the CO2 to O2 reaction is endothermic, so it takes more energy to be put in than you get back. So if plant life is attempting to get energy from photosynthesis, then why would it do an endothermic reaction which would take energy away from its cells?

Homework Statement Which one is more reactive, CO2 or NO2? Homework Equations The Attempt at a Solution I drew the Lewis structures of these species and found there is one delocalized electron in NO2, so I think NO2 is more reactive. Am I correct?

What are the differences between carbon dioxide solubility (miscibility, reaction) in liquid water when in gaseous (<38 bar) and liquid (>38 bar) phase? The temperature in my experiments is usually between 0 and 5°C. The stirring speed is around 500 rpm. Is the solubility given apart from...

NASA is looking for a process to use CO2 as a Carbon source on Mars; ultimate goal is to use the Carbon in the synthesis of other products. $50,000 prize. Open to U.S. citizens, permanent residents, and U.S. business entities, work must be done in the U.S...