What is the least dense liquid under normal conditions?

What is the least dense liquid under normal conditions, room temperature, one atmosphere of pressure, doesn't combust upon contact with air, also wouldn't kill a human just for being in the same room as it?




[Isopentane](https://en.wikipedia.org/wiki/Isopentane) $\ce{C5H12}$ has the density of $0.6201~\mathrm{g\,cm^{-3}}$ at $20~\mathrm{^\circ C}$ [1, p. 3-330].


### References


1. Haynes, W. M.; Lide, D. R.; Bruno, T. J. CRC Handbook of Chemistry and Physics: A Ready-Reference Book of Chemical and Physical Data.; *CRC Press*, **2017**; Vol. 97. ISBN 978-1-4987-5429-3.


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According to



> 
> Hans Jaffe: Eine metallische Verbindung von Lithium mit Ammoniak. Elektrische Leitfähigkeit und galvanomagnetische Effekte. *Z. Physik* 93, 741–761 (**1935**) <https://doi.org/10.1007/BF01337859>
> 
> 
> 


the saturated solution of lithium in liquid ammonia (approx. $\ce{4NH3 \cdot Li}$) has a boiling point above RT, and is significantly less dense (=0.48 g/ml) than isopentane (0.62), or plain ammonia (0.77):



> 
> ... Mit einer Dichte von 0,48 ist die gesättigte Lösung von Li in
> NH3 die leichteste bei Zimmertemperatur existierende Flüssigkeit. Die
> feste Verbindung ...
> 
> 
> 


I wasn´t able to get the full text, unfortunately. And yes, there is a possibility for it to ignite if not handled under an inert atmosphere. How dangerous I don´t know.


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