Cubic Inch (in³)
The cubic inch, symbol in³, is a US customary and imperial unit representing the volume of a cube with each side one inch in length. Its use dates back centuries in English measurement systems. Today, it is particularly significant in the automotive industry, where it historically defined engine displacement before metric liters became common. One cubic inch equals 16.387 milliliters, making it a small but practical unit for precision engineering, manufacturing, and certain niche applications.
Liter (L)
The liter, symbol L, is a metric unit of volume equal to one cubic decimeter (dm³). First introduced in France in 1795, it became the standard for everyday liquid measurements. While technically not a SI base unit, the liter is accepted for use with the SI due to its practicality. One liter equals 1,000 milliliters and 0.001 cubic meters, and is used worldwide as a unit of volume. It is utilized in cooking, chemistry, and other applications where standard volume measurement is required.