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Resistance offered by the molecules of a liquid to flow is termed as viscosity.

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Isomers

Different substances that have the same formula.

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Coulomb

Unit of electrical charge.

xylic acid

Any of six colorless, crystalline, isomeric acids having the formula C9H10O2, derived from xylene.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Crystalline Solid

A solid characterized by a regular, ordered arrangement of particles.

Photochemical Smog

A brownish smog occurring in urban areas receiving large amounts of sunlight, caused by photochemical (light-induced) reactions among nitrogen oxides, hydrocarbons and other components of polluted air that produce photochemical oxidants.

 

Bubbles

Have you ever noticed that soap bubbles go up in winter and fall down in summer? The reason is that warm air is lighter than cold. And in winter the difference between the air temperature in the room (especially near the windows) and the one you exhale into the bubble is enough to overcome the heaviness of its shell.

xanthene dye

Any of a group of dyes having a molecular structure related to that of xanthene in which the aromatic (C6H4) groups are the chromophore.