The question, "Is 18 gauge bigger than 20 gauge?" is a common one, especially for those working with wire, metal sheets, or needles. The answer is yes, 18 gauge is bigger than 20 gauge. But understanding why requires a look at the somewhat counterintuitive system of gauge numbers.
How Does Wire Gauge Work?
Unlike many measurement systems where larger numbers mean larger sizes, wire gauge works in reverse. The lower the gauge number, the thicker the wire. This system, known as the American Wire Gauge (AWG), originated in the United States and is still widely used today. It's a logarithmic scale, meaning the diameter doesn't increase linearly with the decreasing gauge number. Instead, each subsequent gauge size represents a roughly constant ratio change in diameter.
Why the Reverse System?
The reason for this backwards system isn't entirely clear, but it likely stems from historical practices. Early wire-drawing methods made it more intuitive to relate the number of times a wire was drawn through a die (reducing its diameter) to its gauge number.
Is 18 Gauge Thicker Than 20 Gauge? Yes!
To reiterate, since lower gauge numbers indicate thicker wires, an 18-gauge wire is thicker and has a larger diameter than a 20-gauge wire. This difference in thickness is significant and impacts the wire's capabilities: 18-gauge wire can carry more current and is stronger than 20-gauge wire.
What are the Practical Implications?
The difference between 18 gauge and 20 gauge significantly impacts various applications:
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Electrical Wiring: 18-gauge wire is often used for household circuits, while 20-gauge might be found in lower-current applications like lighting fixtures or extension cords. The thicker 18-gauge wire can handle higher amperage without overheating.
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Jewelry Making: In jewelry making, the gauge impacts the thickness and strength of the wire. 18-gauge wire is more substantial and suitable for heavier pieces, while 20-gauge is often preferred for delicate designs.
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Needles: Needle gauges also follow a similar system. An 18-gauge needle is thicker than a 20-gauge needle, influencing the type of fabric it can penetrate.
Frequently Asked Questions
What is the diameter of an 18-gauge wire?
The exact diameter varies slightly depending on the material (copper, aluminum, etc.), but an 18-gauge wire has a diameter of approximately 1.024 mm (0.0403 inches).
What is the diameter of a 20-gauge wire?
A 20-gauge wire has a diameter of approximately 0.812 mm (0.032 inches).
Where can I find a wire gauge chart?
Many online resources provide comprehensive wire gauge charts, detailing the diameter and other specifications for different gauge sizes. A simple Google search for "wire gauge chart" will yield numerous results.
Which gauge is better for my project?
The best gauge for your project depends on your specific needs. Consider factors like the required current carrying capacity (for electrical wiring), the strength and durability needed, and the aesthetic considerations (for jewelry or other crafts).
By understanding the AWG system and the implications of different gauge sizes, you can choose the appropriate wire or needle for your application. Remember that smaller gauge numbers mean thicker wire, and this thickness directly impacts the strength and current-carrying capacity of the wire.
