Question

different between normal density and limiting density​

Answer 1

Normal Distribution:-

The normal distribution is the commonly used “bell curve” for modeling unbiased uncertainties and random errors of the additive kind and symmetrical distributions of many natural processes and phenomena. A commonly cited rationale for assuming normal distributions is the central limit theorem (cf. Section 3.4), which states that the sum of independent observations asymptotically approaches a normal distribution regardless of the shape of the underlying distribution(s):

limiting density:-

The density of a gas when the ratio of density per unit pressure is extrapolated to zero pressure, the point at which a gas exhibits ideal-gas behavior.