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Capacitance is usually measured in microfarads (abbreviated uF or mfd) or picofarads (pF). The microfarad is one millionth of a farad , and the picofarad is one-millionth of a microfarad .

Scattering occurs when light or other energy waves pass through an imperfect medium (such as air filled with particles of some sort) and are deflected from a straight path. A great example is when the sun’s rays pass through clouds. The light is deflected off of its straight path and scatters in many directions.

Black absorbs the most heat and white absorbs the least.

Galvanometer is the first instruments used to detect and measure small amounts of electric currents.

Polyvinyl chloride (PVC) is a widely used plastic containing carbon, hydrogen and chlorine.

Optic nerve, second cranial nerve, which carries sensory nerve impulses from the more than one million ganglion cells of the retina toward the visual centres in the brain.
The vast majority of optic nerve fibres convey information regarding central vision.

Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal. Other symptoms may include headaches and eye strain.

In addition to cancer, exposure to UV rays can cause other health problems. UV rays, either from the sun or from artificial sources like tanning beds, can cause sunburn.

In chemistry, isomers are ions or molecules with identical formulas but distinct structures. Isomers do not necessarily share similar properties. Two main forms of isomerism are structural isomerism and stereoisomerism.

Picric acid, also called 2,4,6-trinitrophenol, pale yellow, odourless crystalline solid that has been used as a military explosive, as a yellow dye, and as an antiseptic.

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