Bernoulli's theorem: The total energy per unit volume of a non-viscous, incompressible fluid in a streamline flow remains constant.
Beta particle: An electron emitted from a nucleus in radioactive decay.
Binding energy: The net energy required to decompose a system into its constituent particles.
Black body: An ideal body which would absorb all incident radiation and reflect none.
Black hole: The remaining core of a supernova that is so dense that even light cannot escape.
Boyle's law: For a given mass of a gas at constant temperature, the volume of the gas is inversely proportional to the pressure.
Brewster's law: States that the refractive index of a material is equal to the tangent of the polarizing angle for the material.
Brownian motion: The continuous random motion of solid microscopic particles when suspended in a fluid medium due to the consequence of ongoing bombardment by atoms and molecules.
Bulk's modulus of elasticity: The ratio of normal stress to the volumetric strain produced in a body.
Buoyant force: upward force on an object immersed in fluid.
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