|A wirdou.com chemistry of love stylized image (Ѻ), conceptualizing love as the formation of a perfect chemical bond, a covalent bond in particular, between sodium and chlorine.|
See main: Chemistry of loveIn human chemistry, love is an umbrella term that encompasses the overall emotional and energetic evolution state of the process of a spontaneous combination reaction between two human molecules, in which commonly two previously unattached people, A and B, collided in life (reaction existence) to unite in the form of a dynamic AB couple: 
A + B → AB
The word "love", however, is intimately linked to the word "hate", particularly in reference to chemical bonding dynamics. Namely, when the term love is used to signify a certain level of attraction to a quality of a person, object, or objective, and conversely when the word hate is used to signify a certain level of repulsion to the same person, object, or objective, then the two labels function as balancing stabilizers in the bond, as found, for instance, in a 5-to-1 ratio in long term marriage bonds. 
Neurochemistry | Neuroanatomy
See main: NeurochemistryIn the late 20th century, researchers began to discern the neurochemical and neuroanatomical underpinnings of love.
In 2004, Forbes reported on the work of Andreas Bartels and Semir Zeki, who claimed to have produced the first fMRI images of the brain on love: comparing images of those looking at pornography, to images of people in love, to those of mothers looking at their infants, found the scans of the latter two were almost identical—except in the people in love case, where there was extra activity in the hypothalamus, which is linked to sexual arousal: the reward center of the brain lights up when in love, but some regions get turned off: those commonly associated with things like moral judgment. 
|A 2015 Instagram post (Ѻ) on love and reality and whether or not one should be realistic about love.|
See main: Thermodynamics of loveIn human thermodynamics, love is a term that is quantified by the release of functional or usable work energy, particularly Gibbs free energy, out of a thermodynamic system during an evolution cycle. One of the first to write semi-correctly about the thermodynamics of love was American computational chemist David Hwang in his 2001 article "The Thermodynamics of love". 
Some have postulated a relationship between love and entropy. According to American economist Jeremy Rifkin, for instance, “Love is not antientropic, as some would like to believe. If love were antientropic, it would be a force in opposition to becoming, for the entropic flow and becoming go hand in hand. Rather, love is an act of supreme commitment to the unfolding process. That is why the highest form of love is self-sacrifice—the willingness to go without, even to give one’s own life, if necessary, to foster life itself.” 
The following are related quotes:
“Love is gravitation toward a beautiful object.”— Ortega y Gasset (c.1920) 
“We call love what binds us to certain creatures only by reference to a collective way of seeing for which books and legends are responsible. But of love I know only that mixture of desire, affection and intelligence that binds me to this or that creature. That compound is not the same for another person. I do not have the right to cover all these experiences with the same name.”— Albert Camus (1942), The Myth of Sisyphus 
“True love is like ghosts, which everybody talks about and few have seen.”— Francois La Rochefoucauld (c.1865)
“There are many people who would never have been in love, had they never heard love spoken of.”— Francois la Rochefoucauld (1665), Maxims (#136) 
1. Top 150 Definitions of Love - Institute of Human Thermodynamics
2. Thims, Libb. (2007). Human Chemistry (Volume One), (preview). Morrisville, NC: LuLu.
3. Gottman, John. (1994) Why Marriages Succeed or Fail. New York: Fireside.
4. Hwang, David. (2001). "The Thermodynamics of Love", Journal of Hybrid Vigor, Issue 1, Emory University.
5. Rifkin, Jeremy. (1989). Entropy - Into the Greenhouse World (formerly published as Entropy: a New World View, 1981), (pg. 291). New York: Bantam Books.
6. (a) Herper, Matthew. (2004). “The Science of Love”, Forbes, Jun 06.
(b) All you need is … (2010) – TwistedPhysics.TypePad.com.
7. Solomon, Robert C. (1981). Love: Emotion, Myth, & Metaphor (pg. 3). Prometheus Books, 1990.
8. (a) Camus, Albert. (1942). The Myth of Sisyphus (pg. 55). Gallimard.
(b) Solomon, Robert C. (1981). Love: Emotion, Myth, & Metaphor (pg. 3). Prometheus Books, 1990.
9. Solomon, Robert C. (1981). Love: Emotion, Myth, & Metaphor (pg. 6). Prometheus Books, 1990.
● Love – Wikipedia.