What is the unit of pressure in the SI system?

The correct answer is Pascals.

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: What is the unit of pressure in the SI system. The correct response is Pascals, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Pressure in gases (physics only), the marking point should connect directly to (Physics only) Identify pressure in pascals and volume in metres cubed when using the pressure-volume relationship. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Particle model and pressure, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 561 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.