chemistry

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metal extraction from household waste

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Plastic packaging usually states the type: PP, PET, PU, ​​PVC, PS, etc… Recently I saw PEL. Does anyone know what plastic this is?

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Why does the plastic PVC continue to be promoted for all kinds of applications, PP has many more advantages than disadvantages?

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Can a battery, which is running on its last strength, still display the correct weight in a scale?

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Where does a polar molecule compound not dissolve in an apolar solvent?

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How can fats (non-polar substances) dissolve in water (polar substance) when washing dishes?

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What does gunpowder consist of?

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Is there a device that converts ordinary air into 100% oxygen?