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Difference between physical and chemical change
Physical does not affect chemical composition
Chemical change produces a new substance
Water to steam(physical)
Burning fuel (Chemical)
What is an element ?
A substance that cannot be chemically reduced any further
What is adhesion?
The attraction of different molecules to each other
What is Cohesion?
The attraction between the same molecules
Relative density of air ?
0.076 Ib/ft³ or 1.29 kg/m³
Relative density of water?
62.4 lb/ft³ , 10imp gal , 8.33 US gal , 1000 kg/ m³
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