Question

How long will powdered malt dissolve in hot water?
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Answer 1

It it dry or liquid malt extract? Dry malt extract will dissolve into the water, leading to a minimal volume change, whereas liquid malt extract still has a substantial portion of water, and will have somewhat like the volume change you describe, though I don't believe it's quite 1:1.

Answer 2

Answer:

When improperly stored, malt will experience degradation of flavor and aroma. However, under the appropriate circumstances brewing malt can be saved for quite a while.

Ideally, malted grains will be stored uncrushed, in a cool environment (below 90°F) with little to no moisture. Moisture has the most impact on malt when stored for extended periods, so use a container that is air tight and place in a low-humidity location.

Explanation:

please let me know if my answer is wrong