Write a detailed report on the history of the metric system in america

An object has a weight of 500 on earth what is the mass of this object

Gunpowder residue is most likely to show up where on a shooters hands

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water