The history of the material of our drop is
in reality nothing
other than the story
of a great many consecutive collisions.
If every particle that makes up our drop
has suffered so many collisions
then how many
determined the history of our drop?
It would be not easy, and it is not the purpose
of these considerations,
to find the true
number of these collisions.
Only one thing is for sure.
It would not be sufficient
to multiply the number
of particles in our drop with the number
of collisions suffered by each particle.
That would just be the sum of the collisions
suffered by all the particles in our drop.
In order for the result of a collision to be exactly determined
the motion of each
of the participating
particles must be completely defined.
This movement however is affected by the last collision
particle, which most likely is not in
our drop, and whose movement is shaped through
its previous collisions with others "foreign" particles
and so on.
If, as we accepted it, there exists
a deterministic sequence
beginning of the Cosmos to the moment
when we consider the drop,
the outcome of all these collisions must be
If only the smallest uncertainty
existed about the outcome of the collisions
would be different.
It would not be deterministic!
Now that we have studied in greater detail
such a simple phenomenon
as the fall of
a raindrop, the conclusion to which our
decision to accept the absolute accuracy
in the power of Natural Law led us,
begins to seem unbelievable.
Were we perhaps
a bit rushed to
reach this decision in chapter 5?
Maybe it would be advisable
before we take such
a serious decision about
the determinism in Nature, to deal in more detail
with the predictability of collision which is shown
to be the major cause of the phenomena.
Before doing this, however,
let's take a look at the second example.