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softness wallpapers

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Donut close up
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White Roses
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Higgledy-piggledy
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Bee & daisy sepia
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Dark red rose
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Raindrops VI.
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Mother Nature ...
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Bouquet
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White Lilies
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Cookies
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Sweet Waffles
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Night Owls
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Raindrops V.
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Capture moment
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Coffee with cinnamon
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French candy jar
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Dewdrop on the leaf
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Letter
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Rusty leaves
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Softness winter
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Summer II.
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First snowdrop
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Austin Botanical Garden VII.
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Seasons IX.
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Hardness is a measure of how resistant solid matter is to various kinds of permanent shape change when a compressive force is applied. Some materials, such as metal, are harder than others. Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, there are different measurements of hardness: scratch hardness, indentation hardness, and rebound hardness. Hardness is dependent on ductility, elastic stiffness, plasticity, strain, strength, toughness, viscoelasticity, and viscosity. Common examples of hard matter are ceramics, concrete, certain metals, and superhard materials, which can be contrasted with soft matter.

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