1. What is Specific Gravity of Seawater?

Definition: This calculator converts the specific gravity of seawater to density in pounds per cubic foot (lb/ft³).

Purpose: It helps marine engineers, oceanographers, and aquatic researchers understand seawater properties.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \rho \) — Density of seawater (lb/ft³)
• \( SG \) — Specific gravity of seawater (unitless)
• 62.4 — Density of pure water at standard conditions (lb/ft³)

Explanation: Specific gravity is multiplied by the density of water to get the actual density of seawater.

3. Importance of Seawater Density

Details: Seawater density affects buoyancy, ocean currents, and marine vessel design. Typical seawater has SG ~1.025.

4. Using the Calculator

Tips: Enter the specific gravity of seawater (default 1.025). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical SG of seawater?
A: Most seawater has specific gravity between 1.020 and 1.030, averaging 1.025.

Q2: Why 62.4 lb/ft³ for water?
A: This is the density of pure water at 4°C (39°F) at standard atmospheric pressure.

Q3: What affects seawater specific gravity?
A: Salinity (typically 3.5%), temperature, and pressure all influence seawater density.

Q4: How does this compare to freshwater?
A: Freshwater has SG ~1.000 and density ~62.4 lb/ft³, making seawater about 2.5% denser.

Q5: When would I need this calculation?
A: When designing marine structures, calculating buoyancy, or studying oceanographic phenomena.