The document discusses Bernoulli's equation and its applications. (1) Bernoulli's equation states that for an incompressible and inviscid fluid, the total mechanical energy of the fluid is constant. (2) It describes how fluid pressure decreases as velocity increases according to the conservation of energy. (3) Some applications of Bernoulli's equation include Bunsen burners, flow sensors, ejectors, carburetors, aircraft wings, and spoilers on cars.