Measurement

the scientific measurement of light in terms of its intensity, color, and other properties

The astronomer used photometry to determine the luminosity of distant stars by measuring their light intensity.

an instrument used to measure and indicate the altitude of an object above a fixed level, typically the Earth's surface

The pilot checked the altimeter before takeoff to ensure an accurate reading of the aircraft's altitude.

a device used to measure the speed and direction of the wind

The meteorologist used an anemometer to measure the wind speed during the weather report.

the unit of electric current, symbolized as "A" in the International System of Units

The circuit was designed to handle a maximum current of 10 amperes to ensure safety.

a scientific instrument used to measure air pressure

Barometer readings are a useful indicator of how weather might differ at higher elevations compared to sea level.

a unit to measure the purity of gold, the purest gold being 24 karats

The jeweler confirmed that the necklace was made of 18 karat gold, which is 75% pure gold mixed with other metals for added strength.

the total length of the external boundary of something

The geometry student calculated the perimeter of the rectangular garden to determine how much fencing would be needed.

the measurement of land elevation variations comparing to sea level or a chosen reference point

Hypsometry helps map mountains and valleys accurately.

the measurement and analysis of water flow, levels, and properties in natural bodies of water and hydraulic systems

Hydrometry helps determine river flow rates for flood forecasting.

the measurement and analysis of the spectrum of electromagnetic radiation emitted or absorbed by substances

Chemists use spectrometry to identify unknown compounds in samples.

a device used to measure the electric potential difference between two points in an electrical circuit

A voltmeter indicated a low battery charge in the flashlight.

a device used to measure the pressure of gases in a closed system, typically by comparing it to atmospheric pressure

A manometer indicated low tire pressure in the car.

a temperature sensor that generates electricity based on heat

The oven uses a thermocouple to regulate its temperature.

the scientific study of measurement, including the development of measurement standards and techniques

Metrology laboratories test and certify measuring instruments.

the scientific measurement of heat exchange in chemical or physical processes

Calorimetry measures the heat released or absorbed during a chemical reaction.

the measurement of variations in gravitational fields to understand the Earth's structure and properties

Scientists use gravimetry to study the movement of tectonic plates.

a measure of the brightness of a light source as perceived by the human eye

The luminance unit measures the brightness of a television screen.

the process of measuring how dense something is by assessing how much light it absorbs or transmits

Densitometry revealed the concentration of pollutants in the river water.