AskScience AMA Series: I spent the last year investigating the potential of carbon-capture technology (or "clean coal") to mitigate climate change. Ask me anything! |
- AskScience AMA Series: I spent the last year investigating the potential of carbon-capture technology (or "clean coal") to mitigate climate change. Ask me anything!
- How wide can a straw be before holding water in there with your thumb fails?
- Can you bend spacetime with electromagentism?
- How do designers determine how many compressor stages a gas turbine engine needs?
- Wildfire Forensics: How do fire investigators determine the cause of a large, wildfire?
- A bullet is shot and is travelling at 2,500 FPS. As the bullet travels, is the space directly behind it (let’s say an inch) filled with air? Or does the bullet push it aside and there is ‘nothing’ behind it?
- How is an antenna able to receive and transmit data? And how is the antenna able to convert that data to something the radio can read?
- How did scientists discover that mars had a magnetic field?
- At What Latitude is the Largest "Sea-Locked" (All-Ocean) Circle of Latitude?
- What's the physics behind shooting a plastic bottle cap?
- Are there any real health risks when using a copper pot over open fire? - I've read aboutdangers due to copper being a biocid and dangerous copper ions transisting into your food. is this just some BS ?
- How have we estimated the size of the universe to be 92 billion light years in diameter?
- Why do toilet seats feel colder than the air, even though they are the same temperature?
- What is more commonly used in nuclear bombs? Uranium or plutonium? Same question for nuclear power plants.
- At what speed does wind chill become air friction?
- What is the uncertainty in the mass of the earth?
- Can anyone explain the Mouse Utopia experiments in a less tinfoil-hatty way?
- How involved is the strong force in creating mass?
- Why are OLEDs used in screens instead of LEDs?
- Do leopards dislike garlic?
- Does color blindness affects the psychology of a person?
| Posted: 07 Dec 2017 04:00 AM PST Under the goals of the 2015 Paris climate agreement, the world has agreed to do what is needed to keep global temperatures from not rising above 2 degrees C as compared to pre-industrial levels. According to the International Panel on Climate Change, in every economically viable scenario to that goal, the world needs to deploy carbon-capture technologies on large scale. These technologies allow us to keep burning fossil fuels almost without emissions, while putting us on the trajectory to hit our climate goals. They are considered a bridge to a future where we can create, store, and supply all the world's energy from renewable sources. But carbon-capture technologies have a tortured history. Though first developed nearly 50 years ago, their use in climate-change mitigation only began in earnest in the 1990s and scaling them up hasn't gone as planned. My initial perception, based on what I had read in the press, was that carbon capture seemed outrageously expensive, especially when renewable energy is starting to get cheap enough to compete with fossil fuels. At the same time, my training in chemical engineering and chemistry told me the technologies were scientifically sound. And some of world's most important bodies on climate change keep insisting that we need carbon capture. Who should I believe? The question took me down a rabbit hole. After a year of reporting, I've come to a conclusion: Carbon capture is both vital and viable. I've ended up writing nearly 30,000 words in The Race to Zero Emissions series for Quartz. You can read the 8,000-word story where I lay the case for the technology here: https://qz.com/1144298; other stories from the series here: https://qz.com/re/the-race-to-zero-emissions/; and follow the newsletter here: https://bit.ly/RacetoZeroEmissions. I'll be answering question starting 1200 ET (1700 UTC). You can ask me anything! Bio: Akshat Rathi is a reporter for Quartz in London. He has previously worked at The Economist and The Conversation. His writing has appeared in Nature, The Guardian and The Hindu. He has a PhD in organic chemistry from Oxford University and a BTech in chemical engineering from the Institute of Chemical Technology, Mumbai. [link] [comments]  |
| How wide can a straw be before holding water in there with your thumb fails? Posted: 06 Dec 2017 10:34 AM PST Assuming you put your thumb on top while the bottom is still submerged, lift it out of the water, and then hold it in the air. [link] [comments]  |
| Can you bend spacetime with electromagentism? Posted: 06 Dec 2017 02:57 PM PST |
| How do designers determine how many compressor stages a gas turbine engine needs? Posted: 07 Dec 2017 03:58 AM PST Does it go down to trial and error or is there a way to determine how many an engine needs? [link] [comments]  |
| Wildfire Forensics: How do fire investigators determine the cause of a large, wildfire? Posted: 06 Dec 2017 10:15 AM PST I have read of incidents where fire investigators are able to identify the root cause of a fire down to a single campfire, or even a single cigarette butt or tossed match. How are they able to do this? I would think the number of variables (not limited to: wind speed and direction over the entire course of the fire, topography, combustible material composition, etc.) would be so large that trying to trace back to the initial source would be next to impossible. Can anyone clue me in with how they are able to do this? [link] [comments]  |
| Posted: 07 Dec 2017 01:37 AM PST |
| Posted: 06 Dec 2017 02:34 PM PST How is a metal rod able to receive radiowaves. It is because of its ability to receive EM waves easily due to its material and texture? In a radio, we can listen to the DJ, but how are we able to hear so audibly when the audio message is sent through radiowaves or microwaves? [link] [comments]  |
| How did scientists discover that mars had a magnetic field? Posted: 07 Dec 2017 04:20 AM PST I was wondering about how exactly they discovered it and what methods they used. When i search I mostly find that mars HAD a magnetic field (or in part still has) but not how they know or became to know. Thank you for your help. Im asking out of curiosity by the way. [link] [comments]  |
| At What Latitude is the Largest "Sea-Locked" (All-Ocean) Circle of Latitude? Posted: 06 Dec 2017 01:02 PM PST I'm looking for the largest circle you can draw on Earth at constant latitude that would never intersect land. [link] [comments]  |
| What's the physics behind shooting a plastic bottle cap? Posted: 06 Dec 2017 01:17 PM PST Hey everyone, hope you're having a good day! I very much like this subreddit because of the wide variety of questions that are asked here, from really theoretical questions to daily applications of science. The thing I woud like to talk about belongs in the second category of daily applications of science in shooting plastic bottle caps. I am sure that a lot of you have tried this at some point, but let me explain what I mean exactly: If you take an empty plastic bottle (for example a water bottle or a soda bottle) and try to crunch it as much as you can with the cap still on it, you will be able to build up a lot of air pressure inside the bottle. If you then quickly unscrew the cap while the air is compressed, the cap will shoot off! I do not know a lot of physics myself, but most of the fluid dynamics that I have heard of revolved around incompressible fluids and not gases, so I was wondering if there were any formulas or calculations one could make to figure out things like the compressibility of the air inside a plastic bottle, the built up potential energy in compressing the bottle and the conversion from potential to kinetic energy when you shoot the cap. I hope you guys will enjoy this topic! [link] [comments]  |
| Posted: 07 Dec 2017 03:37 AM PST I know, this sounds like belonging to one of the less scientific answer forums but i would rather prefer a scientific approach to the question and feel cappable of understanding " complicated "answers. I've read about "unsuitable copper grades and so on" - what I personally consider utter bullcrap. since most industrially produced copper is 99,99 or above in purity, and i don't think that any ( copper) smith is going to melt some randomly found alloy to produce a billet which he will hammer into a plate out of which he will form a kettle - but still there rests this miniscule thought of possibly injuring my family when utilising such a kettle for producing chili/stew/ gulasch not sure about the flair - could be chemistry, could be biology, could be material sciences Thanks for your help. [link] [comments]  |
| How have we estimated the size of the universe to be 92 billion light years in diameter? Posted: 06 Dec 2017 10:14 PM PST |
| Why do toilet seats feel colder than the air, even though they are the same temperature? Posted: 06 Dec 2017 11:42 PM PST When I sit on the toilet, the seat feels much colder than the air, even though they are approximately the same temperature. Why is this? [link] [comments]  |
| Posted: 06 Dec 2017 08:08 PM PST |
| At what speed does wind chill become air friction? Posted: 07 Dec 2017 03:49 AM PST So if space a shuttle on atmospheric reentry has a heat shield to protect against air friction but the wind around most moving vehicle creates a drop in temperature due to wind chill, is there a specific measurable speed where this effect changes? [link] [comments]  |
| What is the uncertainty in the mass of the earth? Posted: 06 Dec 2017 09:52 PM PST |
| Can anyone explain the Mouse Utopia experiments in a less tinfoil-hatty way? Posted: 06 Dec 2017 08:56 AM PST I watched this video but the whole channel has a conspiracy theory slant that I don't trust. [link] [comments]  |
| How involved is the strong force in creating mass? Posted: 06 Dec 2017 01:32 PM PST It is my basic understanding that most of an atom's mass arises from the energy of the quarks inside nucleons. But since the strong force (via gluons) dictates how these quarks operate, how much of a hand (if any) does the strong force have in the creation of this mass vs. the sheer kinetic energy of the quarks? [link] [comments]  |
| Why are OLEDs used in screens instead of LEDs? Posted: 06 Dec 2017 08:05 PM PST I am researching OLEDs, how they work and how they are used. I know that a typical "LED" display is actually an LCD display backlit by LEDs and that an AMOLED display can be thinner because the OLEDs emit light on their own instead of needing a backlight. My question is why can't we just use normal LEDs in a small RGB pixel arrangement like AMOLED screens since they also emit their own light? Why are the options only OLED or LED backlight? Is there something specific to using organic compounds that allows this to happen? [link] [comments]  |
| Posted: 06 Dec 2017 09:51 AM PST I was reading a book (collection of writings of St Ambrose, so 4th century Roman) and St. Ambrose was saying this is the true, I looked it up and didn't find anything, but it's kind of an interesting thing I thought. This could just be people being silly in the 300s. [link] [comments]  |
| Does color blindness affects the psychology of a person? Posted: 06 Dec 2017 09:19 AM PST |
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