Heat is actually not the activity of molecules. That is called internal energy, specifically, interior kinetic energy. Internal potential energy is that associated with intermolecular forces.
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Heat is actually among two develops of energy transfer. That is due exclusively to a temperature difference in between substances. The other type is work (mechanical power transfer).
Heat transfers the kinetic power of the molecules from a substance at greater temperature to the molecule of a substance at lower temperature. A good pictorial of the principle can be uncovered here: http://hyperbarisalcity.org.phy-astr.gsu.edu/hbase/thermo/temper.html
Hope this helps.
Maybe your concern stems indigenous a usual confusion around the meanings of "heat" and "temperature".
The notion of temperature originates from our skin"s tardy of warmth. Cautious science showed that our perception of high or short temperature correlates come the quantity of random molecular motion in an object, even if it is it is solid, liquid, or gas. Thermometers were invented to carry out a continual measurement of temperature, independent of our perception.
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Further mindful science confirmed that the amount of power required to adjust the temperature of an object by a offered amount relies on the composition of the object as well as the massive of the object. The section of interior energy consisting of random molecular motion was termed "heat". So, the term "heat" is just our name for the random-motion component of energy. So, asking why heat is the result of (random) molecular motion, then, is a bit like asking why your username is JuliaW.
On the various other hand, you might really be asking why we perceive enhanced random molecular motion as equivalent to a greater temperature. However that question, too, is almost unanswerable: it"s akin to questioning why we perceive a certain range of wavelengths together "red". The reality that we have temperature sensors in our skin, though, does have actually an explanation but it"s in the realm of evolutionary biology rather than tough barisalcity.org: it"s because it provided our ancestors a survival advantage.