Poh Ling Yeow Instagram – It’s legit thermodynamics, guys! I couldn’t handle it anymore and hit up our fave doctoré of physics. So here’s the low down on why Grandma’s plastic bag ain’t melting, explained by @drmattagnew – thank u for letting us borrow your excellent brain 🪐💥. Now we can finally sleep in peace. And ppl please, of course I am not endorsing the use of this ‘appliance’. It’s obviously born of POVERTY so everyone please keep your bpa trigger knickers on and appreciate the science for just one moment! Also, sorry but the soundtrack WILL haunt you for days. “Basically, the melting point of the plastic is *higher* than the boiling point of the water. What this means is that water will heat up to 100C, then begin boiling and the temperature won’t ever go higher. Since 100C is lower than the melting point of the plastic, it won’t melt. It seems weird, but basically the heat from the flame will heat up the plastic, but once it reaches higher than the 100C, the heat will flow into the water (heat flows from hot to cold). Any additional heat added to the plastic will keep just flowing straight to the water so the plastic will also stay at 100C. So this will continue until all the water is boiled off. Now there is nowhere for the heat to flow so the plastic will rise temperature quickly and then melt.”