BUT I don't think solid to liquid volume change can be calculated using a constant - so your 5% may be wrong because you have a 'state change'
yes, the coefficients are not constant, they depend on the temperature and the pressure ok well that's really going to go out of my league. can any of you smart guys tell me how much the volume would change when cooling from 1234K to 300K? Maybe chanc3r's solid/liquid numbers are the most useful (depending on your accuracy requirements)... until someone finds the nonlinear coefficients for silver  density of solid silver at room temperature = 10.49gcm^-3
density of liquid silver at melting point= 9.320gcm^-3
perhaps this is a simpler - the ratio of the densities will give you a volume change between liquid silver and room temperature solid silver.
good point. the mean between those values would be a good estimation. |
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BUT I don't think solid to liquid volume change can be calculated using a constant - so your 5% may be wrong because you have a 'state change'
yes, the coefficients are not constant, they depend on the temperature and the pressure ok well that's really going to go out of my league. can any of you smart guys tell me how much the volume would change when cooling from 1234K to 300K? do you plan to cast silver yourself? That is pretty complicated. yes i do and yes i know. what we are talking about right now is just part of the complications  |
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BUT I don't think solid to liquid volume change can be calculated using a constant - so your 5% may be wrong because you have a 'state change'
yes, the coefficients are not constant, they depend on the temperature and the pressure ok well that's really going to go out of my league. can any of you smart guys tell me how much the volume would change when cooling from 1234K to 300K? |
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awesome! i can never make heads or tales of fancy math stuff like that. it looks like french to me. i just have to work through the logic in my head |
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For the smart maths people out there This chart says http://www.engineeringtoolbox.com/volum-expansion-coefficients-solids-d_1894.html the volumetric thermal expansion coefficient of silver is 58.3 (10-6 m/(m K)) i can only assume they mean m^3 since that is how you would measure volume. So if i multiply 58.3*0.000001 i get 0.0000583 So silver expands at 0.0000583 meters cubed per meter cubed per kelvin. Room temperature is about 300 kelvin. The melting point of silver is about 1233 kelvin. So that's a difference of 933 kelvin. So then i just multiply 0.0000583*933 and get 0.0543939 meters cubed per meter cubed of change. Ive got to be honest that seems crazy. a 5.5% change in size as it cools? there is no way that can be right. Its written as a linear expansion coefficient e.g. (m/m K) not (m^3/(m K)), a linear coefficient which is change in length per meter and degree of temperature, volumetric is 3x linear for a solid, but another reference I have says the volumetric expansion coefficient for silver is 54 *10^-6 (m^3/(m K)) AT 20C - I don't think solid to liquid volume change can't be calculated using a constant - sorry. it doesn't need to be. the only point at which shrinking matters is past the point at which it has transitioned from liquid to solid. as long as its liquid it can flow freely through out the chamber of the mould. so the point at which it becomes solid is the upper bound for what i need to calculate. |
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are there any engineers here who can double check some math for me?
depend what it is. same question... same answer |
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are there any engineers here who can double check some math for me?
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that is awesome! no need to build any fancy features for this into the client though. i hope he doesn't try to do that. all we need is some clear cut syntax that service providers who build services ONTOP of the block chain (probably web based) can know how to interpret. In the client we just need to be able to issue a few specific commands like bid x amount on id number y. im sure cfb knows all this.
I hope he does. its important not to centrally plan too much. it stifles innovation. certain things its best to just let develop organically and naturally. |
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@ Native English people
Guys, I'm working on Digital Goods Store and need few words/phrases/terms for the following:
- To place goods for sale
- Opposite to above (when u cancel selling this goods)
- A comment that is left by a customer when they r (not) satisfied with the quality of purchased goods
- A tag that is used to describe goods to make it easier to find them (like "game", "online", "mmorpg" for online game codes)
- A process of send goods to buyers (actually it's publishing encrypted text on the blockchain)
list cancel review detail clear maybe though we dont need that much. this is going to be the territory of dedicated service providers. probably these service providers will just offer a html front end for scanning the block chain, condensing, organizing and displaying relevant data. inorder to interact with that service provider you will do it through your nxt client not their webiste. the website will be for displaying of information only. and there can be lots of competing providers for this service. i dont think there is any point in imagining that clients will handle this sort of thing ontop of everything else. probably only want a field for "the fact that i am listing an item for sale in digital goods store" "identification number" "price" "# of blocks until expire" "all other information". And just let the syntax for the "other information field" develop organically and naturally, i wouldn't try to plan that bit. |
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I'm thinking of making an ebay style action site that accepts NXT. Not sure if the coming asset exchange makes this endeavor moot however. It would be good to have another site that accepts NXT. Opinions? Also, since I have little more than motivation and money - any advice on how to find and what sort of programmers to get?
Thanks!
PS -
if there is a more appropriate forum for this, please let me know.
it does not make it moot. asset exchange is totally different. though an ebay like service built on the block chain would be awesome. cfb is working on it as we speak. that is awesome! no need to build any fancy features for this into the client though. i hope he doesn't try to do that. all we need is some clear cut syntax that service providers who build services ONTOP of the block chain (probably web based) can know how to interpret. In the client we just need to be able to issue a few specific commands like bid x amount on id number y. im sure cfb knows all this. |
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For the smart maths people out there This chart says http://www.engineeringtoolbox.com/volum-expansion-coefficients-solids-d_1894.html the volumetric thermal expansion coefficient of silver is 58.3 (10-6 m/(m K)) i can only assume they mean m^3 since that is how you would measure volume. So if i multiply 58.3*0.000001 i get 0.0000583 So silver expands at 0.0000583 meters cubed per meter cubed per kelvin. Room temperature is about 300 kelvin. The melting point of silver is about 1233 kelvin. So that's a difference of 933 kelvin. So then i just multiply 0.0000583*933 and get 0.0543939 meters cubed per meter cubed of change over 933 degrees. Ive got to be honest that seems crazy. a 5.5% change in size as it cools? there is no way that can be right. |
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I'm thinking of making an ebay style action site that accepts NXT. Not sure if the coming asset exchange makes this endeavor moot however. It would be good to have another site that accepts NXT. Opinions? Also, since I have little more than motivation and money - any advice on how to find and what sort of programmers to get?
Thanks!
PS -
if there is a more appropriate forum for this, please let me know.
it does not make it moot. asset exchange is totally different. though an ebay like service built on the block chain would be awesome. |
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For the smart maths people out there
This chart says volumetric expansion coefficient of silver is 58.3 (10-6 m/(m K)) i can only assume they mean m^3 since that is how you would measure volume.
So if i multiply 58.3*0.000001 i get 0.0000583
So silver expands at 0.0000583 meters cubed per meter cubed per kelvin.
Room temperature is about 300 kelvin. The melting point of silver is about 1233 kelvin. So that's a difference of 933 kelvin.
So then i just multiply 0.0000583*933 and get 0.0543939 meters cubed per meter cubed of change, or delta = 0.0543939 m^3/m^3. (i think i did that right)
Ive got to be honest that seems crazy. a 5.5% change in size as it cools? there is no way that can be right.
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i think its clever Anon is alive. yep just busy on my project |
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Let's call them Nxtcoins so that everybody will stop calling Nxt Nxtcoins
OUTSTANDING. bravo. all agreed? That would be major dumb... As there isn't enough confusion right now ... ^^ i think its clever |
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we might offer a bounty for the homepage design.
whitepaper will be released probably on 13th ~20:00:00 GMT, maybe earlier. It will include new screenshots of our application and some more source code.
lyynx pulled out. check spreadsheet for details. |
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whats eta on asset exchange? anyone know?
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Final draft. What do you guys think? I'm pretty sure this is what the bars are going to look like.
It looks very nice! When do you think you will produce the first bars? Well i cant tell you that because i don't know but i can tell you what i'm doing now and what i have left to do. at this moment i am trying to get the dimensions just right since there are some issues with the bars changing size while cooling and getting worn down a bit in finishing. i have to make the cavity of the mould over-sized so im trying to figure out by how much. then i have to build a model of the entire mould. next i have to find someone to convert it from skp to cad. next i have to find cnc machinist who can make the mould out of the cad file. then i have buy a furnace some silver shot and finally i have to actually make my first bar. |
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