In the ideal gas law, what does n represent?

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

If i add water to oil what will happen