Law which states that the total energy of a system and its surroundings remains constant. Another way to look at it is that the change in the energy of a system equals the heat flow in the system from the surroundings minus the work done by the system on the surroundings. The First Law of Thermodynamics is also known as the Law of Conservation of Energy.
1. Each time energy is converted from one form to another, some of the energy is always degraded to a lower-quality, more dispersed, less useful form.
2. No system can convert energy from one form to another useful for with 100 percent efficiency.
3. Energy cannot be spontaneously transferred from a cold body to a hot body.
4. The entropy of a system increases over time.