Which one among the following measures the same quantity as that is measured by the SI unit 'pascal'?

torr

The correct answer is option 2. torr.

Out of the choices you provided, the unit that measures the same quantity as the SI unit pascal (Pa) is  torr.

Pascal (Pa): It is the SI unit of pressure. Pressure is defined as force (measured in newtons) exerted per unit area. So, 1 Pa is equal to 1 newton per square meter (N/m²).

Torr: It is a non-SI unit of pressure commonly used in some scientific fields, particularly vacuum technology.

Conversion between Pascal and Torr:

1 torr is defined as 1/760 of a standard atmosphere (atm). We know that 1 atm is equal to 101325 Pa. Therefore:

\(1 \text{ torr} = (\frac{1}{760} atm) × (101325 Pa\text{ atm}^{-1}) ≈ 133.32 Pa\)

Other options:

Watt (W): This unit measures power, which is the rate of doing work (energy) per unit time. It's not the same as pressure.

Newton (N): This unit measures force, another distinct quantity from pressure.

Joule (J): This unit measures energy, not pressure.