Difference between density and intensity?
Answers
Density refers to mass concentration, that is, the amount of mass that is contained in a certain volume (or surface, if we are talking about a 2D system). Intensity however refers to power concentration, with time becoming a fundamental factor.
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Density and intensity are similar concepts in that both refer to a concentration of another magnitude. Density refers to mass concentration, that is, the amount of mass that is contained in a certain volume (or surface, if we are talking about a 2D system).
Intensity however refers to power concentration, with time becoming a fundamental factor. Imagine I talk about the intensity of a current in a river. What I am talking about is the amount of water that goes through the river per second, divided by the width of the river. This is very similar to electrical current intensity, that is the amount of electrical charge that passes through a cable per second, divided by the cross section are of a cable. We can also talk about light intensity, that is the energy per second that receives a surface iluminated by the light, divided by the area of the surface.
So the big difference between the two is including a time factor for the case of intensity. All rivers have the same water density (because the liquid water always occupies 1l/kg approx), while they while have different current intensities depending of how fast the water travels in the river.
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