do magnets stick to glass

The short answer is no, for the most part.

Glass is a non-magnetic material, meaning it does not produce any magnetic field on its own. Magnets work based on the principle of attraction between opposite poles and repulsion between similar poles. Therefore, for a magnet to stick to a surface, that surface must either be magnetic or have a magnetic metal component.

There are, of course, exceptions to this rule. Some types of glass contain small amounts of magnetic metal particles, which can make them weakly magnetic. However, this is not common in everyday use and not something that consumers can easily identify. Additionally, even in these cases, the magnetic force is generally not strong enough to support any significant weight.

Moreover, the thickness of the glass also plays a role in determining its magnetism. Thin glass sheets, such as those used in smartphones or smartwatches, are less likely to be magnetic than thicker glass, such as that used in fridge doors or whiteboards.