This fact may lead you to believe that ice should form on the bottom o. less dense than the water and continues to float on the lake's surface. molecules takes up more space when frozen, ice is less dense than liquid water.
But why does ice do this, and, more importantly, why does water freeze from the top to the bottom, when most other substances freeze from the bottom up? Water freezes from the top down—which allows ice to float—because of a strange quirk .
Matter is made up of particles called atoms and molecules. Water is the name of the liquid phase of H2O molecules, and ice is the name of the solid phase. plants and fish to live through the winter in northern lakes and ponds. Ice is lighter than water, even though it is a solid form of water, so ice floats.
Why is it that the ice in your pond expands when it freezes instead of shrinking and why does ice float? This cool and heavy water sinks to the bottom of the pond as the lighter warmer water rises to the top to cool. form crystals that are spaced farther apart causing ice to expand and take up more space.
Also the density of ice is smaller than water so it will float. enter image description here unit at the bottom of the pond:), the water doesn't necessarily have a As heat energy continues to leave the water, more ice crystals form. There's no mechanism for a lake to freeze bottom-up, unless you found a.