1. What is the Volume of a Gallon?

Definition: A US gallon is defined as exactly 231 cubic inches by law.

Purpose: This calculator converts between gallons and cubic inches, which is useful for engineering, chemistry, and various industrial applications.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( V \) — Volume in cubic inches
• \( G \) — Number of gallons

Explanation: Each gallon equals exactly 231 cubic inches, so we multiply the number of gallons by this constant.

3. Importance of Gallon Volume Calculation

Details: Knowing the exact volume helps in container design, fluid measurements, and converting between different unit systems.

4. Using the Calculator

Tips: Simply enter the number of gallons you want to convert to cubic inches. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is a gallon exactly 231 cubic inches?
A: This definition was established by British law in 1824 and later adopted by the US, based on the volume of 10 pounds of water at 62°F.

Q2: Is this the same as an Imperial gallon?
A: No, the Imperial gallon (UK) is about 1.2 US gallons (277.42 cubic inches).

Q3: What are common uses for this conversion?
A: Useful for engine displacement (often measured in cubic inches), tank capacity calculations, and scientific measurements.

Q4: How many cubic inches are in a quart?
A: Since there are 4 quarts in a gallon, one quart equals 57.75 cubic inches (231/4).

Q5: Can I convert cubic inches back to gallons?
A: Yes, simply divide the cubic inches by 231 to get gallons.