Dust Cloud Expansion Energy Sink Vastly Exceeded Gravitational Energy Source

• Dust cloud of North Tower expanded to about 5 times building volume by 30 seconds from collapse start.
• Heat energy is required to produce expansion:
  Ideal gas law: PV = nRT where:

  P = pressure
  V = volume
  T = absolute temperature
  

• Heat required over 10X gravitational potential energy.
  • Energy required for 3.4X expansion is on the order of 1,500,000 kWH.
  • Gravitational energy was about 100,000 kWH.

CNN video of North Tower collapse