Answer:
decreases
Step-by-step explanation:
When a body is immersed in a fluid, it experiences an upward force, which is called buoyant force or upthrust force.
The formula for the buoyant force is given by
Buoyant force = Volume of body immersed x density of fluid x acceleration due to gravity.
As we go up from the earth surface, the value of density of air goes on decreasing and the value of acceleration due to gravity is also decreasing. So, the buoyant force is also decreasing.