# What is the difference between hydrogel elastic modulus and hydrogel stiffness?

We use the elastic modulus (G’) to represent the strength of VitroGel, which is tested by a dynamic rheometer. A simple conversion between the elastic modulus and stiffness is to calculate at 1:3 ratio. Fox example, if the hydrogel is 100 Pa in G’, which is equal to 300 Pa in stiffness. Therefore, the 4000 Pa G’ of VitroGel High Concentration is around 12,000 Pa in stiffness.

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