What would be the best design for an experiment that tests how much water expands when frozen?
1. Take a small bowl and fill it half full of water. Mark the level. Place it in a freezing compartment of your refrigerator for 8 hours. Observe the results.
2. Purchase a small plastic container and mark increments of volume on the outside. Put in 5 ounces of water and place in the freezing compartment of your refrigerator for 8 hours. Compare the end (frozen) volume with the beginning (liquid) volume.
3. Purchase a small plastic container of bottled of water, any brand, commercially sealed. Mark water line with a marker. Place it in the freezing compartment of your refrigerator for 8 hours. Observe the results.
Answers
Explanation:
Dentin (/ˈdɛntɪn/) (American English) or dentine (/ˈdɛnˌtiːn/ or /ˌdɛnˈtiːn/) (British English) (Latin: substantia eburnea) is a calcified tissue of the body and, along with enamel, cementum, and pulp, is one of the four major components of teeth. It is usually covered by enamel on the crown and cementum on the root and surrounds the entire pulp. By volume, 45% of dentin consists of the mineral hydroxylapatite, 33% is organic material, and 22% is water.[1] Yellow in appearance, it greatly affects the color of a tooth due to the translucency of enamel. Dentin, which is less mineralized and less brittle than enamel, is necessary for the support of enamel.[2] Dentin rates approximately 3 on the Mohs scale of mineral hardness.[3] There are two main characteristics which distinguish dentin from enamel: firstly, dentin forms throughout life; secondly, dentin is sensitive.[4]
Dentin
Human tooth diagram-en.svg
Parts of a tooth, including dentin
Explanation:
n this demonstration a bottle is filled with water and allowed to freeze. The water expands as it freezes which breaks the bottle. This is useful when teaching about the weathering of rocks and freeze-thaw.
Demonstration
In this demonstration a bottle is filled with water and allowed to freeze. The water expands as it freezes which breaks the bottle. This is useful when teaching about the weathering of rocks and freeze-thaw.
Lesson organisation
This demonstration can be set up in one lesson and left in the freezer until the next. The demonstration itself takes only a few minutes.