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•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.

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