1. What is Specific Gravity at 30°C?

Definition: Specific Gravity at 30°C is defined as the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material (usually water) at 30°C.

Purpose: It helps in determining the purity and concentration of liquids, particularly in petroleum and chemical industries.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( SG \) — Specific Gravity at 30°C
• \( BOSG \) — Weight of bottle with oil (kg)
• \( BSG \) — Weight of empty bottle (kg)
• \( BWSG \) — Weight of bottle with water (kg)

Explanation: The formula compares the weight of the oil sample to the weight of an equal volume of water at the same temperature.

3. Importance of Specific Gravity Measurement

Details: Specific gravity measurements are crucial for quality control, product identification, and determining the concentration of solutions in various industries.

4. Using the Calculator

Tips:

• Ensure all weights are measured at exactly 30°C
• Use the same bottle for all measurements
• Measure weights accurately to 0.01 kg
• Bottle with water weight must be greater than empty bottle weight

5. Frequently Asked Questions (FAQ)

Q1: Why is temperature specified as 30°C?
A: Many industries standardize measurements at 30°C for consistency, though some may use 15°C or 20°C depending on the application.

Q2: What if I get a negative result?
A: Check your measurements - bottle with oil weight should be greater than empty bottle weight.

Q3: How accurate is this method?
A: When performed carefully, this method can provide specific gravity measurements accurate to ±0.001.

Q4: Can I use this for any liquid?
A: Yes, this method works for any liquid that doesn't react with the bottle material.

Q5: What's the typical range for specific gravity?
A: Most oils range from 0.8 to 0.95, while water is exactly 1.000 at 30°C.