Explained: Linear Interpolation [Math]

Published: 12 December 2015
on channel: JoshTheEngineer

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In this video, I explain how to obtain the equation for linear interpolation between two points. I then go through a simple example.

Linear interpolation can be useful when you need data at points where data does not exist. This happens a lot when looking at tabulated data. Here are some examples of tabulated data where linear interpolation can come in handy:
Steam/vapor tables in thermodynamics
Property tables in heat transfer
Normal shock tables and isentropic relations tables in gas dynamics

In the video linked to below, I show you how to program this equation into a graphing calculator (TI-83), so you can use it on exams or whenever you need a quick estimate.

https://goo.gl/ntTuKl

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