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A common unit of pressure is the atmosphere, which is equivalent to 760mmHg and 101.3kPa. Thus, to convert a value from mmHg to kPa, we must divide by 760 mmHg/ATM and multiply by 101.3 kPa/ATM.

In this case:

190 mmHg * (1 ATM / 760 mmHg) * (101.3 kPa / 1 ATM) = 25.3 kPa.

This method of units conversion is called dimensional analysis, whereby a value is multiplied by several conversion factors, canceling out the original unit in order to achieve the desired unit.

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