Hi
Can someone explain the second marking point?
Why is it bubbles of air and not C02?
![Hi Can someone explain the second marking point Why is it bubbles of air and not C02 class=](https://us-static.z-dn.net/files/d4e/d4e413e139d10ec2096c3b19f698d689.png)
![Hi Can someone explain the second marking point Why is it bubbles of air and not C02 class=](https://us-static.z-dn.net/files/df8/feafb601d779d80c3ba5228207b9a61a.png)
![Hi Can someone explain the second marking point Why is it bubbles of air and not C02 class=](https://us-static.z-dn.net/files/de3/af9ee3ebb92de3b888f7d64e811fb129.png)