![]() In TeX, \epsilon ( ϵ) denotes the lunate form, while \varepsilon ( ε) denotes the inverted-3 form. In Unicode, the character U+03F5 "Greek lunate epsilon symbol" ( ϵ) is provided specifically for the lunate form. Maybe you do not like the form of the epsilon, there is an alternative varepsilon, which appears larger. For instance, the lowercase delta would be larger than an uppercase letter. Enlarging them would look quite odd in comparison to the other characters. Computer systems therefore offer distinct encodings for them. The size of the lowercase Greek letters epsilon and delta is correct. While in normal typography these are just alternative font variants, they may have different meanings as mathematical symbols. Epsilon (uppercase, lowercase or lunate Greek: ) is the fifth letter of the Greek alphabet. Greek alphabet alpha nu beta ware xi gamma imes delta pi episilon sigma eta t t t t t t tauta. The other, also known as lunate or uncial epsilon and inherited from earlier uncial writing, looks like a semicircle crossed by a horizontal bar. One, the most common in modern typography and inherited from medieval minuscule, looks like a reversed "3". The lowercase version has two typographical variants, both inherited from medieval Greek handwriting. For NaCl(s), the lattice energy is defined as the enthalpy of the reaction NaCl(s) Na + (g) + Cl (g) wit h H called the lattice energy ( HLat ). (i) (lowercase, uppercase ) Lower-case eta, the seventh letter of the modern Greek alphabet. It might be useful to learn it in the form: The Greek letter epsilon in these equations is called the molar absorptivity - or sometimes the molar absorption coefficient. From the vocalic usage of the Ancient Greek letter. You might also find the equation written in terms of A: Thats obviously easier to remember than the first one, but you would still have to learn the equation for absorbance. Unicode (now) calls the curly epsilon "GREEK SMALL LETTER EPSILON" ( ε) (this is a textual Greek letter rather than a math alphabetic symbol) and the symbol that TeX traditionally assigns to \epsilon is called GREEK LUNATE EPSILON SYMBOL ( ϵ) the "symbol" being a hint that this is intended as a mathematical character rather than a textual Greek letter. An important enthalpy change is the Lattice Energy, which is the energy required to take one mole of a crystalline solid to ions in the gas phase. (non-Classical letters), ,, ,, (punctuation) (diacritics) Greek Pronunciation. The situation in TeX is no different really, different communities used different forms of epsilon and it is rather arbitrary which one gets which name. I added a special section about epsilon to the XML/HTML entities spec Historically there has been a lot of confusion over the two forms, (the situation with \phi and \varphi is similar but even more confused as at one point Unicode swapped the reference glyphs).
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