what is the difference between a foam and a spray?
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A spray insulation is referred to open cell or closed cell because of the difference between the small bubbles (cells) that make up the foam. ... The cells are pressed together, so air and mositure are unable to get inside the foam. Because of this, closed cell foam is much more rigid and stable than open cell foam.
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A spray or aerosol is a shower of very small droplets of a liquid or very fine particles of a solid suspended in the air. After a short while the droplets dissipate by falling or blowing away.
A foam is similar to a spray but of air or other gas droplets suspended in a liquid or other medium. Shaving cream, whipped cream, soap bubbles are a foam in a liquid medium. A solid foam can be a sponge or plastic insulation material. Another example of a foam in solid is bread. Yeast used in the production of bread grows and creates pockets of carbon dioxide (CO2) which form the pockets that make the bread soft.