According to the 1. theory, the particles of a gas are constantly moving. every time gas particles hit something and bounce off, they exert a tiny force. pressure is this amount of 2. exerted per unit of area. the amount of force exerted by a gas depends on the size of its container. 3. law states that if a sample of gas is kept at constant 4. , decreasing the volume will 5. the pressure the gas exerts. if you increase the volume, the pressure will 6. according to the kinetic theory, if you do not change the amount of gas or its temperature but 7. the size of the container, the particles will strike the walls more often and the pressure will rise. when the size of the container is 8. the pressure is smaller because the particles hit the walls less often.

Acommon procedure for measuring the velocity of an airstream involves the insertion of an electrically heated wire (called a hot-wire anemometer) into the airflow, with the axis of the wire oriented perpendicular to the flow direction. the electrical energy dissipated in the wire is assumed to be transferred to the air by forced convection. hence, for a prescribed electrical power, the temperature of the wire depends on the convection coefficient, which, in turn, depends on the velocity of the air. consider a wire of length l = 20 mm and diameter d = 0.5 mm, for which a calibration of the form v = 6.25 ă— 10â’5 h2 has been determined. the velocity v and the convection coefficient h have units of m/s and w/m2 â‹… k, respectively. in an application involving air at a temperature of tâž = 25â°c, the surface temperature of the anemometer is maintained at ts = 75â°c with a voltage drop of 5 v and an electric current of 0.1 a. what is the velocity of the air?