Observation and Experimentation - Welcome Picnic.

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Presentation transcript:

Observation and Experimentation - Welcome Picnic

Chemistry is everywhere! Yes, even in skiing! ClothingAccessoriesStructural Materials SurfacesSnow and IceAvalanches

Snowflakes Structure of water How is snow formed? Crystal formation, faceting and branching Are all crystals different? Changes in snow over time

Water: Liquid and Ice

Evolution of a snowflake Snow only forms if the crystals grow slowly from the vapor in the air

The structure of ice and ice crystals Hexagonal structure of ice at the molecular level leads to hexagonal crystals

Why do we get different snowflake shapes? Faceting: Filling in the crystal faces Branching: Diffusion of vapor feeds points faster More branching at higher water vapor pressure

Shapes of snowflakes depends mostly on the temperature

Growth of a snowflake

What happens to snow on the ground? Sintering is faster at higher T

“Important applications” of this knowledge Where it is coldest when it snows and where it stays coldest! Where are we going to find the best powder? XX