Hydrometry vs. Hydrology — What's the Difference?

Hydrometry is the monitoring of the components of the hydrological cycle including rainfall, groundwater characteristics, as well as water quality and flow characteristics of surface waters. The etymology of the term hydrometry is from Greek: ὕδωρ (hydor) 'water' + μέτρον (metron) 'measure'.

Hydrology (from Greek ὕδωρ, hýdōr meaning "water" and λόγος, lógos meaning "study") is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and environmental watershed sustainability. A practitioner of hydrology is called a hydrologist.

An instrument used to determine specific gravity, especially a sealed, graduated tube, weighted at one end, that sinks in a fluid to a depth used as a measure of the fluid's specific gravity.

The scientific study of the properties, distribution, and effects of water on the earth's surface, in the soil and underlying rocks, and in the atmosphere.

(physics) The branch of hydrostatics dealing with the measurement of specific gravity using hydrometers

The science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere

The art of determining the specific gravity of liquids, and thence the strength of spirituous liquors, saline solutions, etc.

The properties, distribution, and flows of water in a specific locale; the hydrological characteristics of a particular place or region.

The art or operation of measuring the velocity or discharge of running water, as in rivers, etc.

The science of water, its properties, phenomena, and distribution over the earth's surface.

The measurement of specific gravity

The branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation