system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is canned soda always so much colder than bottled soda, despite them being in the refrigerator just as long, or long enough to where they should be just as cold?
gpt
When you touch something and it feels cold, that's because heat is leaving your body and flowing into the cold object. This is called thermal conduction, and different materials conduct heat at different rates. This is measured in Watts per meter Kelvin, and **the higher this number is, the faster a material conducts heat**. 

Glass has a thermal conductivity coefficient around **0.8 W/mK**. Aluminum's is around **239 W/mK**. That's a big difference! If you measure the temperature of both liquids right out of the fridge, they will be the same temperature. But the one in metal feels colder in your hand because it is taking heat from you faster than the one in the glass bottle. This means that the drink in the glass bottle will actually stay colder for a longer period of time, since it will take longer for the liquid to absorb the same amount of heat. 

Fun fact: this is also why the benches in saunas are made of wood, not metal. Wood doesnt conduct heat quickly enough to be uncomfortable or to burn your skin in the kinds of temperatures a sauna creates, but metal can.