1. What is Rock Density Conversion?

Definition: This calculator converts rock density from kilograms per cubic meter (kg/m³) to pounds per cubic foot (lb/ft³).

Purpose: It helps geologists, engineers, and construction professionals work with density measurements in different unit systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \rho \) — Density in pounds per cubic foot (lb/ft³)
• \( \rho_{kg/m³} \) — Density in kilograms per cubic meter (kg/m³)

Explanation: The conversion factor 0.062428 comes from the relationship between kg/m³ and lb/ft³ (1 kg/m³ = 0.062428 lb/ft³).

3. Typical Rock Density Values

Details: Most rocks have densities between 125-187 lb/ft³. For example:

• Basalt: ~175-187 lb/ft³ (2800-3000 kg/m³)
• Granite: ~162-175 lb/ft³ (2600-2800 kg/m³)
• Sandstone: ~137-162 lb/ft³ (2200-2600 kg/m³)

4. Using the Calculator

Tips: Enter the rock density in kg/m³ (must be > 0). The calculator will instantly show the equivalent density in lb/ft³.

5. Frequently Asked Questions (FAQ)

Q1: Why convert between kg/m³ and lb/ft³?
A: Different countries and industries use different measurement systems, and conversions are often needed for international projects.

Q2: What's the exact conversion factor?
A: 1 kg/m³ = 0.06242796 lb/ft³ (we use 0.062428 for practical calculations).

Q3: How do I find the density of my rock sample?
A: Measure mass and volume, then divide mass by volume (kg/m³ = 1000 × mass in kg / volume in liters).

Q4: Why do rock densities vary?
A: Density depends on mineral composition, porosity, and moisture content.

Q5: What's the density of water in these units?
A: Water is 1000 kg/m³ or 62.428 lb/ft³ at standard conditions.