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A hydrometer is an instrument that measures the specific gravity (relative density) of liquids—the ratio of the density of the liquid to the density of water. For wine and beer making, a simple hydrometer is used to determine the amount of alcohol in the brew in order to decide when it is ready to be placed in bottles.

Scale to measure the water level in the dam

The texture of the water of the river. Natural water background with ripples and waves.

Low level of a water reservoir in São Paulo, Brazil - Pedro Beicht Dam

Water level meter located in the water of the dam. Concepts for natural resources. Water level gauges in the background is the reservoir of water

Water level gauge

Ripple on the lake, dark green lake water, wave

Measure water depth with a folding ruler

Yellowstone Lake and Thumb Geyser view in Yellowstone National Park, Wyoming, USA.

water waves flow river closeup sun shine texture background

Fast running tidal water, slow shutter - motion blur.

Climate change concept, wooden thermometer immersed in water

Close-up of a gauge measuring a high water level at the River Spey in Scotland.

Water level gauge on the river background

River water in sunny days

Water level gauges in the background is the reservoir of water

Surface of a little mountain lake seen from above. The elevated-view image was captured durign summer season.

Background of the water surface of the Salzach river. Texture of water of a mountain river.

Close up of water meter with rotating digit.

There are 3 sizes of cement poles to measure the water level in the reservoir to measure large amounts of water in the rainy season. and less water in the dry season. Soft and selective focus.

Closeup of beaker being filled with liquid. Shallow depth of field, focus on image center

The water is murky and has a greenish tint. The surface of the water is choppy and has ripples

river water

Waves and glare on the surface of the water. Shallow. Lake. Background

Water wave background

Stone bottom of the river, lake with muddy greenish water. Background.

A pressure gauge on a water cannon in a fireboat

Thermometer outside the window

Thermometer, Hygrometer

Free Images: "bestof:hydrometer river water gas texture lake"

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