Studying Repulsive Forces

• Density
• Viscosity
• Elastic Properties
• Intermolecular Forces of Bonding and Repulsion
• States of Matter and Nature of Intermolecular Forces
• Compton Frequency

• Diffraction of Matter Waves in Materials

• https://physics.stackexchange.com/questions/222773/what-is-the-root-cause-of-elasticity-of-a-material

• Elasticity is due to the fact that close to the nucleus, the forces are highly repulsive, and farther away, they are more attractive, and falls of to 0 at infinity. However, there is a 0 point between these two forces, and that's where it breaks.
• Why Tensile Strength Exists (not full explanation): https://physics.stackexchange.com/a/248285/205108