Question

Difficulty: MediumFundamental and Derived Units

Match each physical quantity listed on the left with its corresponding expression in fundamental SI base units on the right.

  • Pressurekgm1s2\text{kg}\cdot\text{m}^{-1}\cdot\text{s}^{-2}
  • Surface Tensionkgs2\text{kg}\cdot\text{s}^{-2}
  • Specific Heat Capacitym2s2K1\text{m}^2\cdot\text{s}^{-2}\cdot\text{K}^{-1}
  • Electric Capacitancekg1m2s4A2\text{kg}^{-1}\cdot\text{m}^{-2}\cdot\text{s}^4\cdot\text{A}^2

Answer

Pressure matches with kgm1s2\text{kg}\cdot\text{m}^{-1}\cdot\text{s}^{-2}, Surface Tension matches with kgs2\text{kg}\cdot\text{s}^{-2}, Specific Heat Capacity matches with m2s2K1\text{m}^2\cdot\text{s}^{-2}\cdot\text{K}^{-1}, and Electric Capacitance matches with kg1m2s4A2\text{kg}^{-1}\cdot\text{m}^{-2}\cdot\text{s}^4\cdot\text{A}^2.
Each quantity on the left is matched correctly to its fundamental SI base unit equivalent derived directly from its defining physical formula.

Step-by-Step Solution

1
Derive base SI units for Pressure
P=FA=kgms2m2=kgm1s2P = \frac{F}{A} = \frac{\text{kg}\cdot\text{m}\cdot\text{s}^{-2}}{\text{m}^2} = \text{kg}\cdot\text{m}^{-1}\cdot\text{s}^{-2}
Pressure is force per unit area.
2
Derive base SI units for Surface Tension
γ=FL=kgms2m=kgs2\gamma = \frac{F}{L} = \frac{\text{kg}\cdot\text{m}\cdot\text{s}^{-2}}{\text{m}} = \text{kg}\cdot\text{s}^{-2}
Surface tension is force per unit length.
3
Derive base SI units for Specific Heat Capacity
c=QmΔT=kgm2s2kgK=m2s2K1c = \frac{Q}{m\Delta T} = \frac{\text{kg}\cdot\text{m}^2\cdot\text{s}^{-2}}{\text{kg}\cdot\text{K}} = \text{m}^2\cdot\text{s}^{-2}\cdot\text{K}^{-1}
Specific heat capacity is thermal energy per unit mass per kelvin.
4
Derive base SI units for Electric Capacitance
C=QV=Askgm2s3A1=kg1m2s4A2C = \frac{Q}{V} = \frac{\text{A}\cdot\text{s}}{\text{kg}\cdot\text{m}^2\cdot\text{s}^{-3}\cdot\text{A}^{-1}} = \text{kg}^{-1}\cdot\text{m}^{-2}\cdot\text{s}^4\cdot\text{A}^2
Capacitance is electric charge divided by electric potential difference.

Key Concept

Expressing derived SI units in terms of fundamental base SI units
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