Question:
Explain why (a) The blood pressure in humans is greater at the feet than at the brain (b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km (c) Hydrostatic pressure is a scalar quantity even though pressure is force divided by area.
Answer:
(a) The height of the blood capillaries is larger at feet than of brain. As a result, the blood pressure is greater at feet than the brain
(b) Density of air decreases with increases in height and reduces to half its value at the sea level at a height of about 60 km. After 6 km, the density of air decreases but rather very slowly. This is why that at a height of about 6 Km, atmosphere pressure reduces to nearly half its value at the sea level.
(c) Force is a vector quantity but pressure is a scalar quantity. According to Pascal law pressure is transmitted equally in all directions i.e. direction is not associated with the pressure. Hence, it is not scalar quantity.
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