Matching SI units to physical quantities

Steps:

• Identify the quantity as latent heat, which measures energy absorbed or released during phase change per unit mass.
• Recall that energy is measured in joules (J) and mass in kilograms (kg).
• Divide energy by mass to get the specific latent heat unit: J/kg.
• Verify against options to confirm the match.

Why B is correct:

• Latent heat is defined as heat energy per unit mass, so its SI unit is J/kg from Q = mL, where L is latent heat.

Why the others are wrong:

• A: Electromotive force uses volts (V), not newtons (N), which is force.
• C: Pressure is force per area (N/m² or Pa), not kg/m.
• D: Weight is force (N), not mass (kg).

Final answer: B