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Musicmystery -> RE: Science anarchists (5/5/2017 8:56:25 AM)
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quote:
ORIGINAL: epiphiny43
English (and the language roots of it's borrowed words) is not Physics. There is confusing overlap between words correctly used in Standard English, and in accurate Physics discussions. Aspirate generally means "Breathed" (From latin/french) and is more commonly used as 'exhale'. In EMS work, it is the term for liquids forced or sucked (Wait!) into lungs, either by accident during a drownding, or deliberately (but unknowingly) by a rescue worker forcing a rescue breathing on a victim with liquids still in mouth or airway. Supposedly how Jimmy Hendrix died, vomiting while unconscious and inhaling his acid vomit.
In English, there is whatever you want to make a word for, and others find a useful term, or interesting concept, enough to remember the definition, and understand what you are saying. It is Not Physics, where terms have definitions which correspond to some physical observation, principle or theory, and get discarded from use if the concept or theory is superseded by a deeper or more elegant understanding, or is proven incorrect.
Thus: you can not 'suck' a gas. Any more than you can pull a string of unconnected marbles. You Can push a gas. What we call suction is changing the size and usually the shape a contained gas or liquid is in, and letting the gas internal pressure, exterior pressure from surrounding material (if in a flexible container) or gravity (if a liquid seeking to find an even level) to force the fluid to fill the larger volume. No force is applied, other than the kinetic energy already in the gas. Though force may be used to change the shape of the 'container'. Similar to liquids in gravity always seeking the lowest common surface ("It's own level), gases seek to distribute pressure and mass in any container to minimum entropy (No area of volume has greater kinetic energy than another). Pressure evens out quickly, temperature follows as fast at heat can move through the mass. "Entropy" is the key to why sucking is a concept, not a real phenomena. Higher heat or higher pressures always move to lower, and total energy in the 'system' is both minimized and homogenized.
Flame in a gas within a gravity field doesn't change the shape of any container, but it alters relative densities of nearby gas masses through localized heating, which expands and changes the buoyancy of that gas portion, such that it rises above nearby now cooler gas, which moves to fill the space below the rising hot gas. Which looks like suction under the rising hot gas, but is more correctly pushed down by displaced gas moving sideways by the rising hot gas, and by general ambient global pressure locally 'violated' by the area right under the flame.
That's a pretty convoluted way of understanding something much more simply explained by gas molecules bouncing without significant attraction and heat increasing the energy of that bouncing.
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