登录
the scientific measurement of light in terms of its intensity, color, and other properties
光度测定
an instrument used to measure and indicate the altitude of an object above a fixed level, typically the Earth's surface
高度表
the unit of electric current, symbolized as "A" in the International System of Units (SI)
安培
the measurement of land elevation variations comparing to sea level or a chosen reference point
测高法
the measurement and analysis of water flow, levels, and properties in natural bodies of water and hydraulic systems
比重测定法
the measurement and analysis of the spectrum of electromagnetic radiation emitted or absorbed by substances
光谱测定法
a device used to measure the electric potential difference between two points in an electrical circuit
电表
a device used to measure the pressure of gases or liquids in a closed system, typically by comparing it to atmospheric pressure
压力计
the scientific study of measurement, including the development of measurement standards and techniques
度量衡学
the measurement of variations in gravitational fields to understand the Earth's structure and properties
重力测定法
a measure of the brightness of a light source as perceived by the human eye
亮度单位
