angle: The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.
application: A particular use or function of something.
concentration: (in chemistry) A measurement of how much of one substance has been dissolved into another.
dissolve: To turn a solid into a liquid and disperse it into that starting liquid. (For instance, sugar or salt crystals, which are solids, will dissolve into water. Now the crystals are gone and the solution is a fully dispersed mix of the liquid form of the sugar or salt in water.)
equation: In mathematics, the statement that two quantities are equal. In geometry, equations are often used to determine the shape of a curve or surface.
football field: The field on which athletes play American football. Owing to its size and familiarity, many people use this field as a measure of how big something is. A regulation field (including its end zones) runs 360 feet (almost 110 meters) long and 160 feet (almost 49 meters) wide.
gelatin: A substance made from animal collagen, usually bones and cow or pig hides. It starts out as a pale colored, tasteless powder. It contains proteins and amino acids. It can make jiggly desserts (like those known as Jell-O). But this substance also is used in yogurt, soups, candies and more. It can even be used as the basis of the clear capsules used to hold single-serving amounts of dry medicines.
glass: A hard, brittle substance made from silica, a mineral found in sand. Glass usually is transparent and fairly inert (chemically nonreactive). Aquatic organisms called diatoms build their shells of it.
incidence: The rate or frequency at which something (usually undesirable) occurs. It might, for instance, be used to refer to how often new cancer cases emerge in a population of people or the rate of at which hurricanes develop each year over some part of the world’s oceans.Â
index of refraction: A measure of how light…
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