On Thu, Sep 29, 2016 at 10:58 PM, DARN wrote:

> I would like to make a comment on the fact that formic acid vapour is
> heavier than air. It is, but as soon as it is released from the liquid
> acid, it quickly diffuses into the surrounding air. Once this diffusion
> takes place, it is just another component of the mixture of gases in the
> hive and, like any other molecule in a gas, has no tendency to settle out.
> It quickly becomes evenly distributed in the container.
>

My understanding is that formic acid vapor obligues varroa to dislodge from
the bees and when at the bottom board they end up dead by a higher
concentration of formic acid there.

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