Answer:
relative humidity
Explanation:
Relative humidity can be measured with a hygrometer
A reaction that is spontaneous means that it can produce products without the supply of energy. The total energy from the reactants reached the activation energy that allow the reaction proceed. An example of this is the decay of a diamond into graphite occuring readily.
Image C is adhesion stronger and Image D is cohesion stronger
Atoms combine<span> by forming chemical bonds</span>
