The most appropriate for measuring the volume of water in a swimming pool is kilolitres.
Consider a pool that is 25 m long by 10 m wide with an average depth of 1.5 m.
V = lwh = 25 m × 10 m × 1.5 m = 375 m³
1 L = 1 dm³, so
V = 375 m³ × (10 dm/1 m)³ = 375 000 dm³ = 375 000 L = 375 kL
Thus, the cubic metre or kilolitre is more appropriate, because it gives more manageable numbers (i.e., between 0.1 and 1000)
