Page 129 - Specialised First Foreign Language 1

and the balloon was based on the idea of floating over

the air as ships float above water, but by filling a large

balloon or several balloons with less dense gas From

the air, the balloon was lifted up, and the most used gas

at the beginning was helium and nitrogen, which was

considered dangerous because it is flammable, and

hydrogen actually caused several accidents, such as the

Hindenburg disaster.

Scientists were still looking for a safer way to fly

using engines, but most of the inventors of aircraft at

that time were impulsive, so most of these planes

crashed immediately before they rose, and not even

their inventors knew the causes of the crash, but the

Wright brothers were more scientific and methodical.

The Wright brothers began to test their ideas first in

small models before they built the actual plane. They

also took notes on the first models, then developed

hypotheses or guesses, and then carried out more

experiments to ensure the correctness of their

hypotheses and this is known as (the scientific method
in Thinking), for example the Wright brothers

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