It is hard to answer this because not much information is given.
A bridge must be made of metal or concrete or other materials that are strong enough to withstand the forces of the traffic passing over it. I doubt that the material could do that.
If the substance is a metal foam, it would make a rather hard cushion.
If the substance is too soft, it would make a cushion.
If the substance has the right combination of softness and elasticity so that it returns to its original shape when you get up, it might be a good material for a cushion.
It it important because it makes people wonder how things work and are made which makes it so they want to move forward with experiments <span />
Answer:
60.052 g/mol (molar mass of vinegar)
84.007g/mol (baking soda )
