Likewise, the liquid state lies between the solid state and the gaseous state in the sense that it is less dense than the solid state and more dense than the gaseous state. Solids and gases are extremes. Solids are usually very ordered in the arrangement of their atoms and molecules, whereas gases show no ordered arrangement of their atoms and molecules. Liquids have a "short-range order", but no "long-range order." So the liquid state has been defined by what it is not like.
The covalent bond illustrated by the two friends sharing an ice cream cone is like a single covalent bond, sometimes called a sigma (s) bond. If, while sharing the cone, they also share the burden of carrying a canoe overhead, this would be like a double covalent bond, sometimes called a pi (π) bond."Bonding" Contexts
Teflon-coated stirring bar magnets on an overhead projector can be used to illustrate an analogy between magnet behavior and polar molecule behavior. If the stirrers are spaced away from each other with a random orientation, then when a magnet passes near them on the overhead light stage, the magnetic stirrers will torque to align themselves parallel to the magnet's magnetic field. Polar covalent molecules behave similarly in an electric field.
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