Is glass a solid or a liquid?
116361
It depends on the temperature at which you are talking about. At room temp glass is a solid. However, at a high enough temperature, glass can be in liquid form, much the same way that ice melts into liquid. It just takes a lot more heat. To clarify from one of the other responses, it is liquid as long as it is in it's liquid phase. Steel is still called steel, even when it is molten enough that it's flow properties are similar to that of water. However, as we interact with steel and glass it is in it's solid phase.
730531
Powders are solids, but at certain conditions they can behave as liquids or have liquid properties.\n\nFor example if you have a box with powder and a hole on the bottom and you inject air from the bottom, the powder will become fluid and behave like a liquid.\n\nQuicksand is a "powder" but if you have the right amount of water inside it will be a liquid you do not want to fell into....
356328
The inner core is a solid and the outer core is liquid.  Although the inner is hotter, the pressure is much more intense.  This keeps it a solid because melting temperature goes up with pressure.  Since the outer core is under less pressure it is assumed to be in a liquid state.  This information has been attained by doing geophysical surveys.  Based on the speed at which waves pass through these substances, a density and composition can be inferred.
126982
Solids, whether pure elements or in general, are crystals made up of ions or molecules, or in rare cases like diamond a single compound of covalent bonds. The thermal stability of a crystal depends on the electrostatic (electrical charge, dipol or quadrupol) property of the constituents and their orientation, as well as their ability to retain constituents placed on the surface to the liquid. Electrostatic forces depend on the charge (or partial charge in case of dipols) and the inverse squared distance of the charges. Quadrupol forces aka Van der Waals forces depend on the inverse sixth potency of the charge.\n\nUsually crystals made up of molecules break up into single molecules when melting. In the liquid these molecules still interact with each other, until at boiling point these interactions aren't strong enough to retain the molecules in the liquid. Crystals made up of ions create ionic melts held together by electrostatic attraction. This isn't found for pure elements, though. Metals are similar in the liquid and solid state, with ionized atoms surrounded by a dislocated electron cloud. Covalently bonded crystals don't melt, but may transform into different compounds.\n\nNote that most elements have several different solid states.\n\nElemental carbon can be found as monomer or low-count polymer fragments in the gaseous phase, no liquid phase (except Buckminster Fullerenes) that I know of and several very different solid phases: graphite (thermodynamically most stable form), diamond, and Buckminster Fullerenes and variations thereof which don't really behave like a solid.\n\nSeveral gaseous elements have no known solids at normal pressure. Iodine has no liquid phase at normal pressure.\n\n\nIn a very general sense, the stronger the attractive forces between the elemental constituents, the more stable the solid/liquid phase. Covalently bonded elements tend to have higher melting points than metals, which in turn tend to have higher melting points than elements occurring in distinct molecules. Quite often the solid and even liquid phases include a change of atomic structure and nature of the bonds. Even in the gaseous phase, sometimes pairing of neutrally charged molecules may occur.
1032546
Glassy solids are considered amorphous solids.  An amorphous solid is a solid in which there is no long-range order of the positions of the atoms.  Common window glass is an amorphous ceramic.\n\nPerhaps you meant what is the difference between "rubbery" and "glassy" states?  The temperature at which there is a  transition between the glassy and rubbery states is called the glass transition temperature.  An amorphous material in the rubbery state is flexible.  In the glassy state, it is brittle.
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The crust and mantle are generally solid.  The inner and outer core are molten rock and metal...very dense, but still liquid.
961628
Two separate questions.  Liquid mercury, for example, contains mercury atoms that are not bonded to each other and are therefore monatomic.  Most metals are also monatomic in solid and liquid state, because heating them will cause them to separate (therefore they have a physical and not a chemical bond).  However, "liquid" and "solid" refer to the interactions between atoms, so you cannot talk about the "form" of a single atom because without other atoms to interact with, there is no meaning to the "liquid" or "solid" terms.
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Glass is more dimensionally stable - it doesn't expand or contract when the temperature changes - and it can be polished to a very smooth surface.   The finish is a very very thin layer of metal.\n\nRead "The Perfect Machine" by Ronald Florence if you want to learn more.
1001328
solid --liquid: melting\nliquid -- solid: freezing\nliquid -- gas: evaporation\ngas -- liquid: condensation\nsolid -- gas: sublimation\ngas -- solid: reverse sublimation
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It is sometimes said that glass in very old churches is thicker at the bottom than at the top because glass is a liquid, and so over several centuries it has flowed towards the bottom.  This is not true.  In Mediaeval times panes of glass were often made by the Crown glass process.  A lump of molten glass was rolled, blown, expanded, flattened and finally spun into a disc before being cut into panes.  The sheets were thicker towards the edge of the disc and were usually installed with the heavier side at the bottom.  Other techniques of forming glass panes have been used but it is only the relatively recent float glass processes which have produced good quality flat sheets of glass.\n\nTo answer the question "Is glass liquid or solid?" we have to understand its thermodynamic and material properties.\n\nThermodynamics of glass\n\nThere is still much about the molecular physics and thermodynamics of glass that is not well understood, but we can give a general account of what is thought to be the case.\n\nMany solids have a crystalline structure on microscopic scales.  The molecules are arranged in a regular lattice.  As the solid is heated the molecules vibrate about their position in the lattice until, at the melting point, the crystal breaks down and the molecules start to flow.  There is a sharp distinction between the solid and the liquid state, that is separated by a first order phase transition, i.e. a discontinuous change in the properties of the material such as density.  Freezing is marked by a release of heat known as the heat of fusion. \n...\nConclusion\n\nThere is no clear answer to the question "Is glass solid or liquid?".  In terms of molecular dynamics and thermodynamics it is possible to justify various different views that it is a highly viscous liquid, an amorphous solid, or simply that glass is another state of matter which is neither liquid nor solid.  The difference is semantic.  In terms of its material properties we can do little better.  There is no clear definition of the distinction between solids and highly viscous liquids.  All such phases or states of matter are idealisations of real material properties.  Nevertheless, from a more common sense point of view, glass should be considered a solid since it is rigid according to every day experience.  The use of the term "supercooled liquid" to describe glass still persists, but is considered by many to be an unfortunate misnomer that should be avoided.  In any case, claims that glass panes in old windows have deformed due to glass flow have never been substantiated.  Examples of Roman glassware and calculations based on measurements of glass visco-properties indicate that these claims cannot be true.  The observed features are more easily explained as a result of the imperfect methods used to make glass window panes before the float glass process was invented.
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1. MATTER - Anything that has Mass and takes up Space.\n\n2. MASS - The measurement of the amount of Matter in an object.  We use a Balance to determine Mass.\n\n3. Matter is Classified (divided) into FOUR STATES:\n\n    a. SOLID - Anything that has BOTH A DEFINITE VOLUME and a DEFINITE SHAPE.  A rock is a solid, solid matter can be picked up and carried around without having to place it in a special container.\n\n    b. LIQUID - Anything that has DEFINITE VOLUME but NO DEFINITE SHAPE.  A key property of a liquid is that they FLOW and can be POURED.\n\n    c. GAS - Has NO DEFINITE VOLUME and NO DEFINITE SHAPE.  A gas ALWAYS TAKES BOTH THE VOLUME AND THE SHAPE OF ANY CONTAINER INTO WHICH IT IS PLACED.  If a gas is NOT in a container, it will spread out as far as it can.\n\n    d. PLASMA - Has NO DEFINITE VOLUME OR SHAPE AND IS COMPOSED OF ELECTRICAL CHARGED PARTICLES.
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I have heard that glass is a very viscous liquid.  A bit of evidence for this is that old cathedral windows tend to be very thin at the top, and thicker at the bottom, because the glass has flowed that way over the centuries.  I believe this bit of wisdom came from an art historian, though, as opposed to a physicist.  For a better discussion, look at the link below.
865526
Solid. The only liquid ones are bromine and mercury I think.\nPotassium is a soft silvery-white metallic alkali metal that occurs naturally bound to other elements in seawater and many minerals
115545
The strict materials definition of glass is a uniform amorphous solid material produced when a suitably viscous molten material cools very rapidly not giving enough time for a regular crystal lattice to form.\nNormal glass like in a window is made from mostly silicon dioxide.\nMany different manufacturing processes, the most used is the float or annealing process.
771649
Do you mean supercooled substances?\n\nIf so, glasses are the best example and are made by melting a salt and quickly cooling it so that it does not return to its original form.  I don't believe you should have any trouble pointing out the various contributions of glass to our lives.
1177266
Your question with a question. Do you know that glass is  made of portions of sand?
273941
to take grandeyeglass's link one level further,\nhttp://www.lsbu.ac.uk/water/phase.html\nWould be nice to get this chart overlayed with adiabatic and iso-volumetric contours.\n\nSo the answer is YES there are pressure/temp regions where the only difference between liquid and solid is purely pressure.\n\nAt a temperature of -10C, and a pressure of 200MPa, H2O is liquid. But if you increase the pressure to 450MPa, H2O solidifies to ice-V with a density of 1.23 g/cc. Also, amazingly, if you decrease the pressure from 200 to 100MPa, it solidifies to ice-Ih with a density of 0.92 g/cc.\n\nAt room temp (20C) you have to increase the pressure to 900MPa to solidify it to ice-VI with a density of 1.31 g/cc.\n\nH2O is amazing stuff... I have learnt something here...