Who re-introduces Democritus' theory of atoms back into modern science in the 1800's?

Identify two types of chemical bonding in the source of dietary potassium

Which description best characterizes the motion of particles in a solid?

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3