How does weight by difference compare to something like saving pencil shavings and weighing them to find how much was sharpened off

You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. naturally, you remove it to a safer place. but before you do, you observe it as it moves from position xi = -92.9 cm to position xf = -64.9 cm along the rail, as measured from a point where one rail abuts the next. what is the snail\'s displacement δx in centimeters?

Why do electron microscopes have higher resolving power than light microscopes?

What is created when solids,liquids,an gases mix with one another