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> Why does squishing things together AND warming them up cause the particles to stick together more than when you just squish them together or just warming them

> Why does squishing things together AND warming them up cause the particles to stick together more than when you just squish them together or just warming them up? >> The equations describing these laws are special cases of the ideal gas law, PV = nRT, where P is the pressure of the gas, V is its volume, n is the number of moles of the gas, T is its kelvin temperature, and R is the ideal (universal) gas constant. >> https://pressbooks-dev.oer.hawaii.edu/chemistry/chapter/relating-pressure-volume-amount-and-temperature-the-ideal-gas-law/ https://pressbooks-dev.oer.hawaii.edu/chemistry/chapter/rela... The laws of thermodynamics describe how gases work, those laws cause the effects you’re asking about. The above is a bit much for a primer on the topic, but provide enough key words for a Google-dive into the subject.

WJW 3y ago
Did you miss the part where I was talking about sintering and diffusion of atoms in materials in their solid phase? A quick search in the article you linked shows zero results for either "sintering", "diffusion" or related terms. The ideal gas law is very nice but hardly applicable to describe things like creep in metals under stress, let alone things like the grain boundary diffusion mechanism for sintering metal particles together.
- salawat 3y ago
  What is a solid but a, relatively speaking, very, very cold gas? Put two solids together with no intervening medium, and heat everything up, and you'll see some mixin' and mingling. Often, the reason you don't see more of that sort of thing is because everything is immersed in an oxygen rich fluid with a tendency to create large, relatively reluctant to mix and mingle oxide coatings before anything fun can happen. Hence why another word for cold welding is vacuum welding. Materials, when you really look at em' are not as 'solid' and 'stable' as you may think. Hence why I have a mechanics of materials book I peruse from time to time.
  - thsksbd 3y ago
    "What is a solid but a, relatively speaking, very, very cold gas?" Well there are two first degree phase changes to consider. Then there are those pesky mtls that dont even follow the general trend of gases, like water that expands when cooled.

WJW 3y ago

Did you miss the part where I was talking about sintering and diffusion of atoms in materials in their solid phase? A quick search in the article you linked shows zero results for either "sintering", "diffusion" or related terms. The ideal gas law is very nice but hardly applicable to describe things like creep in metals under stress, let alone things like the grain boundary diffusion mechanism for sintering metal particles together.

salawat 3y ago
What is a solid but a, relatively speaking, very, very cold gas? Put two solids together with no intervening medium, and heat everything up, and you'll see some mixin' and mingling. Often, the reason you don't see more of that sort of thing is because everything is immersed in an oxygen rich fluid with a tendency to create large, relatively reluctant to mix and mingle oxide coatings before anything fun can happen. Hence why another word for cold welding is vacuum welding. Materials, when you really look at em' are not as 'solid' and 'stable' as you may think. Hence why I have a mechanics of materials book I peruse from time to time.
- thsksbd 3y ago
  "What is a solid but a, relatively speaking, very, very cold gas?" Well there are two first degree phase changes to consider. Then there are those pesky mtls that dont even follow the general trend of gases, like water that expands when cooled.