Corn starch and water make this kind of liquid. Under pressure it acts like a solid but in normal pressure it acts like a liquid. What is it called?

sequoianoir

It is a Non-Newtonian Fluid. [Feb 13 04 8:00 PM] sequoianoir writes: Remember SILLY PUTTY? That gloopy sticky stuff that could remove newsprint but would BOUNCE when thrown at the floor. That is also a non-Newtonian Fluid but I do not believe that it is a colloidal suspension ! [Feb 13 04 8:06 PM] sequoianoir writes: A non-Newtonian fluid is a fluid in which shear stress is not simply proportional solely to the velocity gradient, perpendicular to the plane of shear. Non-Newtonian fluids may not have a well-defined viscosity. Principle types of non-Newtonian fluid include: plastic, pseudo-plastic, perfectly plastic, Bingham plastic, dilatent, rheopectic, thixotropic & visoelastic. Feb 13 04, 7:41 PM

potterguy

http://van.hep.uiuc.edu/van/qa/section/States_of_Matter_and_Energy/Non-Newtonian_Fluids/956104323.htm You can find another Physics Van question and answer about non-newtonian fluids here. As far as I know, there is no such thing as a non-newtonian solid. The cornstarch and water mixture you were asking about is conisdered a non-newtonian fluid, but it is actually composed of both a solid and a liquid. This kind of mixture is called a colloidal suspension, and you can read more about it in the other answer. Feb 13 04, 7:48 PM

potterguy

Really interesting stuff to read about: http://en.wikipedia.org/wiki/Non-Newtonian_fluid non-Newtonian fluid is a fluid in which shear stress is not simply proportional solely to the velocity gradient, perpendicular to the plane of shear. Non-Newtonian fluids may not have a well-defined viscosity. Principle types of non-Newtonian fluid include: plastic pseudo-plastic (apparent viscosity reducing with rate of shear. E.g. gelatine, blood and liquid cement) perfectly plastic (strain does not result in opposing stress) Bingham plastic dilatent (apparent viscosity increasing with rate of shear. E.g. concentrated solution of sugar in water) rheopectic (apparent viscosity increases with duration of stress. E.g. some lubricants) thixotropic (apparent viscosity decreases with duration of stress. E.g. non-drip paints and tomato ketchup) visoelastic (having both viscous and elastic properties. E.g. bitumen and nylon) Feb 13 04, 8:08 PM

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It is known that at a particular atmospheric pressure and temperature, an element or a compound can only exist in one state; either solid, liquid or gas. However, why is that we can have both the solid iodine and iodine solution in the lab, where the temperature and atmospheric pressure are constant? Is it true that you shouldn't take aerosol cans like deodorant or shaving foam on planes in case they explode with change in pressure? Galileo did not believe in the existence of atmosperic pressure. To support his view he would give the following reasoning. Imagine a container with liquid. Within the liquid consider a certain volume. The liquid inside this volume is acted upon by two oppositely directed forces: weight and buoyant force. According to Archimedes' Principle the two forces are equal. This is why the liquid is in {equilibrium;} it neither sinks nor floats upward. We might say, for example, that water immersed in water is weightless. How then can something weightless exert pressure on the underlying layers! Similarly air in air, being weightless, cannot exert pressure on the lower layers, and ultimately the surface of the earth. What is the flaw in his reasoning? Can a gas (oxygen) become a liquid through the application of enough pressure or is the transformation from gas to liquid only obtained through a temperature difference?

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