What soda can and what soda can’t.
Materials. Permeability. Solubility. And how soda cans and plastic bottles affect fizziness and taste.
1-Minute NomNom
Is your soda fresh? If that sounds like a strange question, flip a can of soda and look at the bottom. You will notice an expiry date (see below), and you can use that to decide if your soda is fresh!
We might want to choose the soda can because of permeability. Permeability is the penetration of gas, vapor or liquid through a solid. According to a Slate article, PET has a higher permeability than aluminum. Hence, CO2 can pass through the PET container more rapidly than through a soda can. In fact, as much as 15% of its CO2 could escape over a period of 12 weeks (and hence the expiry dates)!
Our best bet may be glass bottles, which neither dissolve nor are permeable. But, of course, we don’t see glass bottled soda as much anymore.
Second Helpings
Not all have it, but more and more brands of soda come with expiry dates. And now that you know why it matters, paying more attention to them guarantees you will always have fresh soda!
Feed Me!
Do you prefer drinking from a soda can, PET bottle or glass bottle? What is your favorite soda drink? Share them with me!
photos: in order – vook/depositphotos; personal; depositphotos/scanrail; scukrov