Thermal Anomaly of Water

Water has a density anomaly: up to a temperature of 4 °C, water has a negative coefficient of expansion , i.e. it shrinks when warmed. After passing through zero at 4 °C, the coefficient of expansion becomes positive. So the density of water reaches a maximum at 4 °C.
In experiment C1.3.3.1, the density maximum of water is proven by measuring its expansion in a vessel with a riser. Starting from room temperature, the complete setup is cooled down in an ice water bath to about 1 °C under constant stirring, or after cooling in a freezer, it is warmed slowly by the ambient temperature. The level h, in a riser with a cross-sectional area A is measured as a function of the water temperature ϑ. Because the change in volume relative to the total volume V0 is small, the result obtained for density is .
Components of experiments:

1	667 505	Anomaly of water apparatus
1	666 8451	Magnetic stirrer
1	666 851	Stirring magnet, 25 mm x 6 mm diam.
1	602 725	Laboratory dish, 140 mm diam., 900 ml
1	665 009	Funnel, PP, 75 mm diam.
1	307 66	Tubing (rubber)
1	300 42	Stand rod, 47 cm, 12 mm diam.
1	608 040	Stand rod, 60 cm, 12 mm diam.
3	666 555	Universal clamp, 0...80 m
3	301 09	Bosshead S
1	301 09	Bosshead S
2	300 02	Stand base, V-shaped, small
1	531 836	Universal measuring instrument, Chemistry
1	529 676	Temperature probe, NiCr-Ni, 1.5 mm, type K
1	666 194	Protective sleeves for temperature probe, set of 5
1	665 009	Funnel, PP, 75 mm diam.
1	602 011	Beaker, Boro 3.3, 400 ml, tall
1	666 966	Spoon-ended spatula, PP, 180 mm
1	ADACB1001	Compact scale 1000 g; 0,1g
1	666 003	Pipetting ball (Peleus ball)
1	673 5700	Sodium chloride, 250 g

Additional required:permanet marker, crushed ice, ruler (30 cm)