LaTeX Eta (η) - Complete Guide
The Greek letter eta (η) is used in physics and mathematics for efficiency, viscosity, and other quantities.
Symbol Preview
Eta
LaTeX Code
No package required
\etaStandard eta symbol
What is the LaTeX Eta?
Eta is the seventh letter of the Greek alphabet. In physics, it commonly represents efficiency, viscosity, or refractive index. In mathematics, it is used for various parameters and functions.
How to Use Eta in LaTeX
Method 1: Using \eta
✅No package required
Standard eta symbol
Example: Using \eta
\documentclass{article}
\begin{document}
% Using the Eta
Text with \eta
\end{document}Common Use Cases
The Eta symbol is commonly used in the following contexts:
Efficiency
Represents efficiency in physics and engineering.
Code
The efficiency is $\eta = \frac{P_{out}}{P_{in}}$Output
The efficiency is η = P_out / P_in
Viscosity
Used for dynamic viscosity in fluid mechanics.
Code
Dynamic viscosity: $\eta = 0.001$ Pa·sOutput
Dynamic viscosity: η = 0.001 Pa·s
Complete Examples
Motor Efficiency
Efficiency formula using eta
\documentclass{article}
\begin{document}
The motor efficiency is calculated as $\eta = \frac{P_{mechanical}}{P_{electrical}}$.
\end{document}Frequently Asked Questions
Which method should I use?
We recommend using the method marked as "Recommended" above. However, the best method depends on your specific needs:
- \eta: Standard eta symbol
Where do I use this symbol?
This symbol can be used:
- In mathematical equations (math mode)
- In regular text (if using text mode)
- In various document environments
Can I use this in display mode?
Yes, symbols that work in math mode (between $ $) also work in display mode (between $$ $$). This allows you to display the symbol on its own line with larger formatting.
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