A liquid has SG 0.90; given water density 62.4 lb/ft^3, what is its density?

A liquid has SG 0.90; given water density 62.4 lb/ft^3, what is its density?

• A. 56.16
• B. 56.50
• C. 56.0
• D. 56.2

Answer: (A)

Specific gravity tells you how dense a liquid is compared to water. Since water has a density of 62.4 lb/ft^3, multiply by the SG: 62.4 × 0.90 = 56.16 lb/ft^3. The density is 56.16 lb/ft^3, which matches the given value exactly. (Rounding to one decimal would give about 56.2, but the precise result is 56.16.)

Specific gravity tells you how dense a liquid is compared to water. Since water has a density of 62.4 lb/ft^3, multiply by the SG: 62.4 × 0.90 = 56.16 lb/ft^3. The density is 56.16 lb/ft^3, which matches the given value exactly. (Rounding to one decimal would give about 56.2, but the precise result is 56.16.)