Pitch is an auditory sensation in which a listener assigns musical tones to relative positions on a musical scale based primarily on their perception of the frequency of vibration. Pitch is closely related to frequency, but the two are not equivalent. Frequency is an objective, scientific attribute that can be measured. Pitch is each person's subjective perception of a sound, which cannot be directly measured. However, this does not necessarily mean that most people won't agree on which notes are higher and lower. 

This creates a linear pitch space in which octaves have size 12, semitones (the distance between adjacent keys on the piano keyboard) have size 1, and A440 is assigned the number 69. (See Frequencies of notes.) Distance in this space corresponds to musical intervals as understood by musicians. An equal-tempered semitone is subdivided into 100 cents. The system is flexible enough to include "microtones" not found on standard piano keyboards. For example, the pitch halfway between C (60) and C♯ (61) can be labeled 60.5.
What is pitch?
what is it related to?
What is pitch closely related to?
Are they equals?
Is frequency subjective?
What is it?
Then what is subjective?
Which one is  scientific?
Can you measure pitch?
How about Frequency?
Do most agree on high and low notes?
What are semitones?
What is an equal tempered semitone?
is it flexible?
to include what?
Are they found on a piano?
What does a listener assigh to tones?
which is based primarly on what?
an auditory sensation
Pitch is an auditory sensation
musical tones
 musical tones
to frequency
closely related to frequency
no
are not equivalent
no
 Frequency is an objective, 
objective
 an objective
Pitch
Pitch is each person's subjective perception
Frequency
Frequency is an objective, scientific attribute
no
Pitch is each person's subjective perception of a sound, which cannot be directly measured.
yes
Frequency is an objective, scientific attribute that can be measured
yes
However, this does not necessarily mean that most people won't agree on which notes are higher and lower.
the distance between adjacent keys on the piano keyboard
semitones (the distance between adjacent keys on the piano keyboard)
An equal-tempered semitone is subdivided into 100 cents
An equal-tempered semitone is subdivided into 100 cents
Yes
The system is flexible enough to include "microtones" not found on standard piano keyboards
microtones
 to include "microtones
No
not found on standard piano keyboards.
relative positions on a musical scale
relative positions on a musical scale
on their perception of the frequency of vibration
based primarily on their perception of the frequency of vibration