Homologous series
Melting points from methanoic acid to eicosanoic acid
| Index | Name | Value |
| 1 | methanoic acid | 8 |
| 2 | ethanoic acid | 15.5 |
| 3 | propanoic acid | -36.5 |
| 4 | butanoic acid | -5.7 |
| 5 | pentanoic acid | -59 |
| 6 | hexanoic acid | -3.4 |
| 7 | heptanoic acid | -8 |
| 8 | octanoic acid | 16.7 |
| 9 | nonanoic acid | 12 |
| 10 | decanoic acid | 31.6 |
| 11 | undecanoic acid | 29 |
| 12 | dodecanoic acid | 43 |
| 13 | tridecanoic acid | 41 |
| 14 | tetradecanoic acid | 58 |
| 15 | pentadecanoic acid | 53 |
| 16 | hexadecanoic acid | 63 |
| 17 | heptadecanoic acid | 61 |
| 18 | octadecanoic acid | 69.6 |
| 19 | nonadecanoic acid | 69 |
| 20 | eicosanoic acid | 75 |
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