دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a chart used in measuring gas with orifice meters on which are recorded differential and static pressures. It uses a logarithmic scale from 0 to 10. The readings must be converted, but it can be used on any flow recorder, regardless of range. Also called square-root chart.

n: a scale in which the distances of numbers from a reference point are proportional to the logarithms of the numbers.

n: a unit of measure of the acid or alkaline condition of a substance. A neutral solution (such as pure water) has a pH of 7;acid solutions are less than 7;basic, or alkaline, solutions are more than 7. The pH scale is a logarithmic scale. A substance with a pH of 4 is more than twice as acid as a substance with a pH of 5. Similarly, a substance with a pH of 9 is more than twice as alkaline as a substance with a pH of 8.

n: a parameter used to measure the acidity or alkalinity of a substance.