Sonar detector.
Sound is simply the vibration of matter so it exists under water, in rocks, and even in lava.
•Tides have been measured many different ways. •In the past, tides were measured with a floating ball in a pipe open to the water. As the water level moved up and down, the floating ball moved with the water level. The ball was connected to a recording device to record the tides. •Today, plastic pipes open to the water and sound waves to measure the water height. The travel time of the sound waves in water can be determined very precisely, giving very accurate measurements of the water height over very short times (many times a second). In deep water, we uses pressure sensors on the bottom of the ocean to measure the water height. •More water above the pressure sensor results in more pressure on the sensor. Pressure can also be measured very precisely.
No. Under controlled circumstances, when you freeze 1 measure of water, it expands to about 1 and 1/10th of a measure. When melted, it will once again equal 1 measure of water.
A measuring jug.========================Answer #2:That depends on whether you want to measure the water's volume,rate of flow, temperature, density, salinity, turbidity, resistivity, purity, etc.Each of those measurements requires a different instrument.
Valve clearances are measured with feeler gauges on cold aircooled engines or warm water cooled engines.
Hydrophone
.
thermometer
It is called a water meter
There are a lot of instruments used to measure water volume. There's also the displacement method to measure liquids.
to for example measure the pressure under water
A scale works just fine
There are a few different ways you could measure the speed of sound in water and air. You could record the amount of time it takes a sound to be heard from the source to the destination for example.
Sound does travel under water otherwise the Humpback would be wasting its time singing!
When under power the sound of the engine and water lapping at the hull. When under sail the sound of water lapping at the hull.
Periscope
Ruler