Items

• range

  The set of values a function may take on
• rarefaction

  A state or region of minimum pressure in a medium traversed by compressional waves (such as sound waves)
• rate

  A quantity, amount, or degree of something measured per unit of something else
• ratio

  The relationship in quantity, amount, or size between two or more things
• rational

  Relating to, consisting of, or being one or more rational numbers
• rational number

  Any number that can be expressed as a ratio of two integers, or in the form p/q, where 'p' and 'q' are integers and 'q' is not equal to zero.
• rays

  A beam of radiant energy (such as light) of small cross section
• reactance

  The part of the impedance of an alternating-current circuit that is due to capacitance or inductance or both and that is expressed in ohms
• reaction

  Chemical transformation or change : the interaction of chemical entities; A process involving change in atomic nuclei
• real

  Existing as a physical entity and having properties that deviate from an ideal, law, or standard
• real number

  All numbers that can be plotted on a number line, including both rational and irrational numbers.
• reciprocal

  Inversely related
• rectangle

  A parallelogram all of whose angles are right angles
• reduce

  To diminish in size, amount, extent, or number
• reference

  Something (such as a sign or indication) that refers a reader or consulter to another source of information (such as a book or passage)
• reflection

  The production of an image by or as if by a mirror
• refraction

  Deflection from a straight path undergone by a light ray or energy wave in passing obliquely from one medium (such as air) into another (such as glass) in which its velocity is different
• relative

  A thing having a relation to or connection with or necessary dependence on another thing.
• repulsion

  The action of repelling : the force with which bodies, particles, or like forces repel one another
• resistor

  A device that has electrical resistance and that is used in an electric circuit for protection, operation, or current control
• resolve

  To split up into two or more components especially in assigned directions
• resonate

  To produce or exhibit resonance
• resultant

  Derived from or resulting from something else
• reversible

  Capable of going through a series of actions (such as changes) either backward or forward
• rigid

  Deficient in or devoid of flexibility