Simulation

Computer simulation started after the second World War.
Working with computers has provided us with a new metaphor for the las of nature.
Computers carry as much information as algorithms.

To make a computer do anything, you have to write a computer program.
To write a computer program, you have to tell the computer, step by step, exactly what you want it to do.
The computer then "executes" the program, following each step mechanically, to accomplish the end goal.
When you are telling the computer what to do, you also get to choose how it's going to do it.
That's where computer algorithms come in. The algorithm is the basic technique used to get the job done.

Molecular Simulation

Computer simulation allow us to study properties of many particals. Not all properties can be directly measured in a simulation.

Molucular Dynamics simulation of liquid water:, we could measure the instantaneous positions and velocites of all molecules in the liquid.