How do we know the temperature outside the high air plane?

How do we know the temperature outside the high air plane?

There are displays in the cockpit. If you are in the cabin, it depends on the model. Some large airliners, such as the A380, can be seen on the display screen in front of the seat. Usually, the outside temperature is about minus 40 ~ 50 degrees Celsius when cruising

When the same ship sails into the ocean from the Yangtze River, does the buoyancy of the ship increase?

No increase
Because when the ship is floating in the river and in the sea, the force on the ship is balanced, which is the balance of gravity and buoyancy, that is, gravity is equal to buoyancy. Because the ship's gravity remains unchanged, the buoyancy will remain unchanged, so the buoyancy does not increase

How does the buoyancy and liquid volume of a ship from a river to the sea change? Important reason

This problem is a little difficult for people who have just learned buoyancy. It doesn't matter. Let me talk about it
According to the sinking and floating conditions, the floating object f floats = g, because the ship floats in the sea and in the river, and the ship g remains unchanged, so the f floats the same. The first question is solved
According to Archimedes law, f float = P liquid GV discharge,
From the top, f floats the same, so
P GV discharge in sea 1 = P GV discharge in water 2
G. because the density of seawater is higher than that of river water, V row 1 ＜ V row 2. Therefore, boil water in the sea
Small liquid volume

Why does the buoyancy of a ship from the sea into a river (or from a river into the sea) remain the same

It's all floating. Buoyancy is equal to gravity

Why does a ship sail from a river into the sea with constant buoyancy and rising or falling draft?

Buoyancy is constant because of floating, buoyancy = self weight, self weight is constant, so buoyancy is constant
The water level drops because when the buoyancy is constant, the density is high and the V row is small

Why are the stones in the river washed into the sea and the buoyancy increases? Why does the buoyancy of ships in the Yangtze River not increase when they sail into the sea?

The stone sinks to the bottom. The gravity is greater than the buoyancy. The volume of discharged water remains unchanged. It is only related to the liquid density. The seawater density is greater than the river density, and the buoyancy is greater
The ship is floating on the water surface. Gravity is equal to buoyancy. The ship's gravity remains unchanged, so the buoyancy remains unchanged. At this time, the density of sea water is greater than that of river water, which means that the volume of discharged water becomes smaller