A material has density 63.0 lb/ft^3. What is its SG to two decimals?

A material has density 63.0 lb/ft^3. What is its SG to two decimals?

• A. 0.99
• B. 1.01
• C. 1.02
• D. 1.03

Answer: (B)

Specific gravity is the ratio of a material’s density to the density of water, so it’s dimensionless. Using water’s density of about 62.4 lb/ft^3, the SG = 63.0 / 62.4 ≈ 1.010, which rounds to 1.01 to two decimals. This means the material is slightly heavier than water. The other options would correspond to densities that don’t match 63.0 lb/ft^3 when referenced to water’s density.

Specific gravity is the ratio of a material’s density to the density of water, so it’s dimensionless. Using water’s density of about 62.4 lb/ft^3, the SG = 63.0 / 62.4 ≈ 1.010, which rounds to 1.01 to two decimals. This means the material is slightly heavier than water. The other options would correspond to densities that don’t match 63.0 lb/ft^3 when referenced to water’s density.