Yaa if the temprature of liquid increase then the buoyancy force exerted by liquid decrease because when we increase the temprature the intermolucer space of liquid also increase which led to a result of decreasing density of liquid .And when density of liquid decrease then the buoyancy force applied by liquid also decreases.That's all.

Introduction:
The buoyancy force is the upward force experienced by an object submerged in a fluid, such as water or air. It is directly related to the density difference between the object and the fluid. When the temperature changes, it affects the density of the fluid, which in turn affects the buoyancy force.

Effect of Temperature on Density:
- As the temperature of a fluid increases, its density generally decreases.
- This is because as the temperature rises, the average kinetic energy of the fluid particles increases, leading to increased molecular motion and more collisions between particles.
- These collisions tend to spread the particles farther apart, reducing the overall density of the fluid.

Effect of Density on Buoyancy Force:
- The buoyancy force is determined by the difference in density between the object and the fluid it is submerged in.
- The greater the density difference, the greater the buoyancy force.
- When the temperature increases and the density of the fluid decreases, the density difference between the object and the fluid also decreases.
- As a result, the buoyancy force decreases.

Explanation:
- When an object is submerged in a fluid, it displaces a volume of fluid equal to its own volume.
- According to Archimedes' principle, the buoyant force acting on the object is equal to the weight of the fluid displaced.
- The weight of the fluid displaced is determined by the density of the fluid and the volume of the object.
- As the temperature increases, the density of the fluid decreases, resulting in a decrease in the weight of the fluid displaced and therefore a decrease in the buoyant force.

Example:
- Consider a hot air balloon filled with hot air, which is less dense than the surrounding cool air.
- The hot air inside the balloon provides buoyant force greater than the weight of the balloon and its contents, causing it to rise.
- If the temperature of the air inside the balloon decreases, the density of the air increases, reducing the buoyant force and causing the balloon to descend.

Conclusion:
- In conclusion, the buoyancy force decreases with an increase in temperature.
- This is because an increase in temperature leads to a decrease in the density of the fluid, resulting in a smaller density difference between the object and the fluid, and thus a decrease in the buoyancy force.