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Imagine an unopened can of carbonated water. At the molecular level, what does it look like? There should be a sea of H2O molecules, with some CO2 and carbonic acid evenly dispersed within it. Now, when the can is opened bubbles will form and rise to the surface. That means that the CO2 molecules, which were previously evenly dispersed within the fluid, decide the aggregate upon the reduction in pressure. Why does this happen? 74.15.137.253 ( talk) 04:20, 20 July 2013 (UTC)
Following up on my sprinkler question, now that I have good advice for how much it should run, I'm curious if I can get it working with an electronic rain gauge. I can see tons of them on Amazon with self-tipping rain buckets and a wireless receiver that reports the rain on an LCD display, and they're in the $25 price range. I'm trying to find one that retransmits the rain as an analog voltage or current on terminals I can connect to, or if I can't find one like that, then something that creates a voltage or shorts some contacts when the rain for some set period goes over a specified limit. Wireless isn't a big deal. 108.194.140.240 ( talk) 12:10, 20 July 2013 (UTC)
Do you put it head first or feet first? OsmanRF34 ( talk) 14:23, 20 July 2013 (UTC)
In Roving Mars, Steve Squyres, principal scientific investigator for the Spirit and Opportunity Mars Rovers, writes on page 211, "It's not a topic that NASA likes to talk about, but rockets can become wild, dangerous things when something goes really wrong with one. If a rocket begins to go seriously off course, it can be necessary to 'render the vehicle nonpropulsive,' as they like to put it, before it heads for a populated area. So every rocket—even the Space Shuttle—lifts off from its launch pad laced with high explosives." He goes on to say that if the rocket strays too far from its intended path, it's the safety officer's job to detonate the rocket. But he doesn't say what happens with all of that explosive ordnance if the rocket doesn't stray off its path. These stages that fall back to the earth with all the fuel and oxidizer used up with explosives too, do they always make sure those explosives go off? I'd like to see a source. 75.75.42.89 ( talk) 14:55, 20 July 2013 (UTC)
At the start: an empty see-through gas lighter and a full can of refill Butane fuel. When you refill the lighter it fills with liquid Butane to about 1/2 capacity. If you disengage the lighter and the refill can and then do the refill process again more fluid flows into the lighter. During the previous fill the contents of both the lighter and the refill can were at equal pressure as there was no further flow of gas/liquid yet when you go for a follow-up 'top-up' refill there is obviously a difference in pressure as more LPG enters the lighter - Can anyone explain the phenomena please? Jason Twell ( talk) 19:17, 20 July 2013 (UTC)
Science desk | ||
---|---|---|
< July 19 | << Jun | July | Aug >> | July 21 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Imagine an unopened can of carbonated water. At the molecular level, what does it look like? There should be a sea of H2O molecules, with some CO2 and carbonic acid evenly dispersed within it. Now, when the can is opened bubbles will form and rise to the surface. That means that the CO2 molecules, which were previously evenly dispersed within the fluid, decide the aggregate upon the reduction in pressure. Why does this happen? 74.15.137.253 ( talk) 04:20, 20 July 2013 (UTC)
Following up on my sprinkler question, now that I have good advice for how much it should run, I'm curious if I can get it working with an electronic rain gauge. I can see tons of them on Amazon with self-tipping rain buckets and a wireless receiver that reports the rain on an LCD display, and they're in the $25 price range. I'm trying to find one that retransmits the rain as an analog voltage or current on terminals I can connect to, or if I can't find one like that, then something that creates a voltage or shorts some contacts when the rain for some set period goes over a specified limit. Wireless isn't a big deal. 108.194.140.240 ( talk) 12:10, 20 July 2013 (UTC)
Do you put it head first or feet first? OsmanRF34 ( talk) 14:23, 20 July 2013 (UTC)
In Roving Mars, Steve Squyres, principal scientific investigator for the Spirit and Opportunity Mars Rovers, writes on page 211, "It's not a topic that NASA likes to talk about, but rockets can become wild, dangerous things when something goes really wrong with one. If a rocket begins to go seriously off course, it can be necessary to 'render the vehicle nonpropulsive,' as they like to put it, before it heads for a populated area. So every rocket—even the Space Shuttle—lifts off from its launch pad laced with high explosives." He goes on to say that if the rocket strays too far from its intended path, it's the safety officer's job to detonate the rocket. But he doesn't say what happens with all of that explosive ordnance if the rocket doesn't stray off its path. These stages that fall back to the earth with all the fuel and oxidizer used up with explosives too, do they always make sure those explosives go off? I'd like to see a source. 75.75.42.89 ( talk) 14:55, 20 July 2013 (UTC)
At the start: an empty see-through gas lighter and a full can of refill Butane fuel. When you refill the lighter it fills with liquid Butane to about 1/2 capacity. If you disengage the lighter and the refill can and then do the refill process again more fluid flows into the lighter. During the previous fill the contents of both the lighter and the refill can were at equal pressure as there was no further flow of gas/liquid yet when you go for a follow-up 'top-up' refill there is obviously a difference in pressure as more LPG enters the lighter - Can anyone explain the phenomena please? Jason Twell ( talk) 19:17, 20 July 2013 (UTC)