What's is the change in the barometer I'd it is carried to the moon
The change in the barometer will depend on the atmospheric conditions of the moon. However, as there is no significant atmosphere on the moon, the barometer reading will remain close to zero.
To explain how to get this answer, it's important to understand that a barometer measures atmospheric pressure. On Earth, the barometer reading is influenced by the weight of the air above it. The atmosphere exerts pressure due to the force of gravity pulling the air molecules down. This pressure is what the barometer measures.
On the moon, the absence of a substantial atmosphere means there is no significant air pressure to exert force on the barometer. This results in an almost zero reading on the barometer when it is carried to the moon.
In order to calculate the exact change in the barometer reading on the moon, you would need to know the precise atmospheric conditions and pressure on the lunar surface. However, since the moon has an extremely thin atmosphere, the change in the barometer reading would be negligible.