NOVELTY - The flow sensing device comprises at least an electrically conducting solid material, such as n-doped Ge semiconductor (1) positioned at angles to gas flow (3), which generates a flow of electricity along the direction of gas flow due to pressure gradient developed across the solid material. The electrical energy is transmitted to the electricity meter by electrodes (2,2') to measure the electricity generated as a function of the rate of flow.    USE - For generating electricity by gas flow over solid material such as doped semiconductors, graphite, etc, and for conversion of energy by gas flow over a solid material using a combination of Seebeck effect and Bernoulli's principle.    ADVANTAGE - Velocity of gas is measured as a function of electricity generated in the solid material due to gas flow along the surface. The phenomenon can be applied in areas such as medical instrumentation, metrology, pollution determination and automobile and aircraft industry and microscopy. Enables generation of electricity without reliance on any nuclear, thermal or hydroelectric power source, but based purely on the flow of gas. Provides flow sensing device which is simple and small in size that does not result in any turbulence, ensures accuracy in flow velocity measurement, and does not require external source of power.    DETAILED DESCRIPTION - The solid material is selected from the group consisting of a doped semiconductor, graphite, single wall type or multi-wall type carbon nanotube and a metallic material with a high Seebeck coefficient.    INDEPENDENT CLAIMS are included for:    (1) A flow sensing device for measurement of gas flow velocities irrespective of flow velocity or nature of gas;    (2) a method for generation of electrical energy using an energy conversion device; and    (3) an energy conversion device.    DESCRIPTION OF DRAWING(S) - Drawing is a schematic representation of the device used for flow measurement of gas velocity according to the method of the invention.    Solid electroconducting material (1)    Electrodes (2,2')    Gas flow (3)