The vacuum was kept until the can was tilted.
The neck of the can is covered with a wire mesh. As it tilts it, the surface tension of the water prevents air from passing through the mesh until it flips over, increasing the pressure at the bottom and allowing air to displace the water at the top.
Our NFT channel
The neck of the can is covered with a wire mesh. As it tilts it, the surface tension of the water prevents air from passing through the mesh until it flips over, increasing the pressure at the bottom and allowing air to displace the water at the top.
Our NFT channel