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An differential expansion system and method for balloon buoyancy control which includes a zero-pressure envelope and a superpressure envelope. A gas transfer device is positioned between the envelopes to facilitate the transfer of lift gases that are lighter than air between the envelopes. The super

An differential expansion system and method for balloon buoyancy control which includes a zero-pressure envelope and a superpressure envelope. A gas transfer device is positioned between the envelopes to facilitate the transfer of lift gases that are lighter than air between the envelopes. The superpressure envelope and the gas transfer device can be located inside the zero-pressure envelope. Alternatively, the zero-pressure envelope, the superpressure envelope, and the gas transfer device can be located inside a zero-pressure envelope.

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I claim: 1. A differential expansion system for balloon altitude control, said system comprising: a volume flexible, zero pressure envelope substantially absent fluid communication with ambient conditions, and a single substantially volume constant envelope, and a lift gas in said envelopes; and a

I claim: 1. A differential expansion system for balloon altitude control, said system comprising: a volume flexible, zero pressure envelope substantially absent fluid communication with ambient conditions, and a single substantially volume constant envelope, and a lift gas in said envelopes; and a gas transfer device in fluid communication with said envelopes, for change of sum envelope volume to control balloon ascent and descent. 2. The system of claim 1 wherein said gas transfer device comprises pump and valve components. 3. The system of claim 1 wherein said gas transfer device comprises a is bi-directional pump. 4. The system of claim 1 comprising a plurality of volume flexible envelopes in fluid communication with said single envelope. 5. The system of claim 1 wherein said single envelope and said gas transfer device are within said volume flexible envelope. 6. The system of claim 1 wherein said gas transfer device comprises a power generation component generating power with lift gas released from said single volume envelope. 7. An atmospheric balloon apparatus comprising first and second envelopes, said first envelope volume flexible and said second envelope consisting essentially of a single volume substantially volume constant envelope within said first envelope, and a gas transfer device in fluid communication with said envelopes, for vertical ascent and descent of said balloon apparatus. 8. The apparatus of claim 7 wherein said first envelope has a volume sufficiently flexible to receive substantially the entirety of a lift gas at a highest pre-determined altitude. 9. The apparatus of claim 8 wherein said second envelope has a volume sufficient to substantially maintain said balloon at a lowest pre-determined altitude. 10. The apparatus of claim 9 wherein said second envelope has a volume from about said sufficient volume to less than about 10% of said sufficient volume. 11. The apparatus of claim 7 wherein at least one of said first and second envelopes comprises a construction minimizing at least one of solar heating and infrared cooling of said balloon apparatus. 12. The apparatus of claim 7 wherein said gas transfer device is within said first envelope. 13. The apparatus of claim 7 as a component of a lighter than air craft. 14. The apparatus of claim 7 further comprising a power generation component. 15. The apparatus of claim 7 wherein said gas transfer device comprises a power generation component generating power with lift gas released from said single volume envelope. 16. A differential expansion balloon system, said system comprising: a balloon comprising a volume flexible, zero pressure envelope substantially absent fluid communication with ambient conditions, a single substantially volume constant envelope, a lift gas in said envelopes, and at least one data sensor selected from balloon superpressure, balloon temperature, ambient pressure/altitude, ascent/descent rate and ambient temperature data sensors; a gas transfer device in fluid communication with said envelopes, for change of sum envelope volume to control balloon ascent and descent; and a microcontroller interfaced with each said data sensor and said gas transfer device, said gas transfer device and said sum envelope volume operatively controlled by said microcontroller, responsive to at least one of said data sensors. 17. The system of claim 16 wherein said volume constant envelope is within said volume flexible, zero pressure envelope. 18. The system of claim 16 wherein said volume flexible, zero pressure envelope has a volume sufficiently flexible to receive substantially the entirety of said lift gas at a highest pre-determined altitude. 19. The system of claim 18 wherein said volume constant envelope has a volume sufficient to substantially maintain said balloon at a lowest pre-determined altitude. 20. The system of claim 16 wherein said gas transfer device comprises a power generation component generating power with lift gas released from said constant volume envelope.