The brain mass, within the skull, actually weighs about 1.5 kilograms, which is a significant weight to carry throughout life. But why don't we feel the weight of the brain in our heads?
Because the brain floats in the cerebrospinal fluid, and the physics law ("Archimedes' principle") states that a body submerged in a fluid loses an amount of weight equal to the volume of the fluid displaced. Therefore, we don't feel the weight of the brain, but only a reduced weight of about 50 grams.
The cerebrospinal fluid moves when one bows in Sujud and Rukü during prayer, providing a gentle massage flow to the brain, inducing a feeling of calmness and relaxation.
Allāh says in Sürah as-Sajdah (the
Prostration), verse 7:
"The One Who created all things excellent." "We have indeed created all things by a proper measure [54:49]
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