1.In early dirigibles, the lifting gas used was hydrogen, due to its high lifting capacity and ready availability.
2.Push-to-talk (PTT), also known as press-to-transmit, is a method of having conversations or talking on half-duplex communication lines, including two-way radio, using a momentary button to switch from voice reception mode to transmit mode.
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Answer:
1.In early dirigibles, the lifting gas used was hydrogen, due to its high lifting capacity and ready availability.
2.Push-to-talk (PTT), also known as press-to-transmit, is a method of having conversations or talking on half-duplex communication lines, including two-way radio, using a momentary button to switch from voice reception mode to transmit mode.
Explanation:
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