Trevithick was the first to successfully use high-pressure steam (then known as "strong" steam). Until ca. 1800, the weakness of existing boilers coupled with the influence of James Watt had generally restricted steam boilers to very low pressures or "weak" steam.
Read MoreAs yet more steam is generated it becomes even more compressed and its pressure continues to increase accordingly. This pressure of the steam is exerted in all directions. So besides pressing on the inside surfaces of the boiler, the steam also creates a pressure on the surface of the water.
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