Observation and Experimentation - Welcome Picnic

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Chemistry is everywhere! Yes, even in skiing!

Clothing Accessories Structural Materials

Surfaces Snow and Ice Avalanches

Snowflakes

Structure of waterHow is snow formed?

Crystal formation, faceting and branchingAre 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 molecularlevel 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

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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?

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