For this article you need to watch this video from MKBHD. He is reviewing the iPhone 8. In this review he makes a remark about the weight of the iPhone 8, but this remark is so horribly wrong that I could not help but highlight this often made mistake - people saying things without doing their research first.

And it is just a bit heavier feeling because glass is after all, a heavier material than metal.

Check out this table of the weights of various different materials, as well as this one and Corning's Gorilla Glass.

It is clear that Corning's Gorilla glass has a density of approximately 2.42 g/cm³. Aluminium has a density of 2.7 g/cm³. Steel is 7.82 g/cm³, 3 times heavier than glass. Only Magnesium and Beryllium is less dense than glass - none of which is ever used alone in manufacturing of phone enclosures. The iPhone 7 is made of anodized aluminium, therefore it is still heavier than glass. Even if it was not, he made a general statement that "glass is a heavier material than metal", which is untrue as most metals are much, much heavier than standard glass.