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The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre.
The yottapascal is a multiple of the unit bit for Pressure. The prefix yotta (symbol Y) is defined in the International System of Units (SI) as a multiplier of 1.0 × 1024 (1 septillion, short scale), and therefore 1 yottapascal = 1.0 × 1024 pascals = 1000000000000000000000000 pascals. The yottapascal has the unit symbol YPa.