The lower the pH reading, the more acidic the solution. Readings from 0â7 are considered acidic, and numbers from 7.0â14 are considered basic, or alkaline. Pure water, in the very middle of the (logarithmic) pH scale, has a pH of 7.0, which is considered neutral.
Bell curve may refer to: 1  A Gaussian function, a specific kind of function whose graph is a bell-shaped curve. 2  Normal (Gaussian) distribution, whose density function is a Gaussian function.ell curve may refer to: 1  A Gaussian function, a specific kind of function whose graph is a bell-shaped curve. 2  Normal (Gaussian) distribution, whose density function is a Gaussian function.
On this chart of a 'normal' distribution, showing the classic 'bell curve' shape, the mean (or average) is the vertical line at the center, and the vertical lines to either side represent intervals of one, two and three sigma.