Editing Water turbine (section)

=== Reaction turbines ===
Reaction turbines are acted on by water, which changes pressure as it moves through the turbine and gives up its energy. They must be encased to contain the water pressure (or suction), or they must be fully submerged in the water flow.

[[Newton's laws of motion#Newton's third law|Newton's third law]] describes the transfer of energy for reaction turbines.

Most water turbines in use are reaction turbines and are used in low (<{{convert|30|m|sigfig=1|disp=or|abbr=on}}) and medium ({{convert|30|-|300|m|sigfig=1|disp=or|abbr=on}}) head applications. In reaction turbine, pressure drop occurs in both fixed and moving blades. It is largely used in dam and large power plants.