. Elementary physics and chemistry: second stage. Science. MAXIMUM DENSITY OF WATER. 39 LESSON VI. MAXIMUM DENSITY OF WATER PRACTICAL WORK. Things required.—Burette, or graduated glass tube. Narrow- mouthed, corked bottle to hold one fluid ounce, or a glass bulb blown upon a short piece of thermometer tubing. Duster. Unmounted thermometer. Small cast-iron cylinder with screw top. Paraffin oil. Ice and salt, and tin to hold them. What to do. Density of ice.—Half fill a burette or graduated glass tube with paraffin oil. Put the burette in a jar containing ice and water until the temperature is n
. Elementary physics and chemistry: second stage. Science. MAXIMUM DENSITY OF WATER. 39 LESSON VI. MAXIMUM DENSITY OF WATER PRACTICAL WORK. Things required.—Burette, or graduated glass tube. Narrow- mouthed, corked bottle to hold one fluid ounce, or a glass bulb blown upon a short piece of thermometer tubing. Duster. Unmounted thermometer. Small cast-iron cylinder with screw top. Paraffin oil. Ice and salt, and tin to hold them. What to do. Density of ice.—Half fill a burette or graduated glass tube with paraffin oil. Put the burette in a jar containing ice and water until the temperature is nearly o° C. Observe the level of the paraffin oil in the burette. Gently drop in pieces of dry ice, and observe the volume of the ice added, by noticing the rise of level of the oil. Let the ice melt, and when it is converted into water, again observe the read- ing of the burette ; it will be less than before. This reading shows that the volume of water produced by the melting of a certain known volume of ice is less than the volume of ice. If the volume of the ice was lo cubic centimetres, the volume of the water produced from it would be 9 cubic centimetres. Expa?tsion of water when freezi7ig.—Obtain a i-oz. corked bottle with a narrow neck. Fill it with water and cork tightly, driving the cork in as far as possible. Pass strong fine twine several times round the bottle from top to bottom and over the cork, to keep the latter in. If the string is likely to slip, notches in the cork will prevent it. A small piece of wood. Fig. 23.—Arrangement for showing that the volume of water produced by niehing ice is less than the volume of the ice Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, R. A; Simmons, A. T. London: MacMillan
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