Powdery Mildew. Overhead watering can lead to powdery mildew on cucumber leaves. Mildew grows quickly on large, older leaves, causing them to turn yellow and wilt. Cucumber fruits are not directly affected, but can become sunburned when the protective leaves wither away, leaving them exposed.
Atomic mass is roughly equal to the sum of the individual particle masses of an atom. Atomic mass is typically calculated by adding the number of protons and neutrons together, ignoring the electrons because of their small size. Daltons are the standard units used for measuring atomic mass.
(chemistry) the mass of an atom of a chemical element expressed in atomic mass units mass energy (physics) the mass of a body regarded relativistically as energy