Most egregious Flat Earth claim - Gravity is simply buoyancy & density - Debunked
First of
all, buoyancy depends on gravity. If there is no gravity, there can be no such phenomenon
as buoyancy. Look up the definition of buoyancy on Wikipedia or search buoyancy
NASA on google, if you don’t believe it.
If gravity
is simply buoyancy and density then why does hot air rise and not go down
instead, or sideways? I’ll tell you
why. Because we live in an environment
where there is a downward force acting on things based on their mass. This can be experimentally verified and it
does not depend on assuming the earth is a sphere. If I put 5 apples in a grocery scale I will
get a certain weight (force). If I put
an additional 5 apples of about the same size in the scale, the scale will
register about twice the weight. So the
force known as buoyancy depends on this downward force proportional to
mass. This is why the deeper you go in a
body of water the more pressure there is.
This is why the higher you go in the atmosphere the less pressure there
is.
Liquid water
is nearly incompressible, so its density does not change much as you go
deeper. In contrast, the atmosphere is
made up of a mixture of gases, and they are very much compressible. So as you go up in the atmosphere, with the
decreasing pressure the gaseous mixture becomes thinner or less dense because it
is becoming less compressed.
If a mass of
air were of the same temperature as the surrounding air, it would not tend to
go up or down, because the upward forces around it based on decreasing pressure
with altitude are balanced by the downward forces upon it based up its
mass. But if the air were hotter than
its surrounding air, its density would be less so that the downward force based
on its mass would be less than the upward force due to decreasing pressure with
altitude so the resulting balance of forces would cause it to rise. This is how
a hot air balloon works.
Interestingly,
forces greater than 1 g (i.e. 1 earth’s gravity) acting upon masses and
proportional to mass can be artificially produced mechanically with
centrifuges, or in an airplane in a steep coordinated turn, where a very steep
turn may be alternately referred to as a high g turn, or pulling many g’s.
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