Be aware that water is a magical substance. For example, the density of its solid form is so low that it is lower than the liquid form, so that the ice is floating on the surface of the water. For another example, it is the highest density at 4 ° C, and the standard of one kilogram is sampled at a mass of 1 L 4 ° C water. For another example, the freezing speed of warm water is faster than the freezing speed of cold water.
In theory, when warm water freezes, the warm water will continue to cool down when it drops to the freezing point of 0 °C. Therefore, we think that warm water icing has a cooling process more than cold water icing, which will take a long time. However, the icing of water not only has physical changes, but also chemical changes. Water icing is the volume will increase the density will become smaller, due to thermal expansion and contraction of the same quality of hot water than the volume of cold water, it will take priority over cold water to reach the solid state.
This small family experiment is to detect the freezing speed of water at different temperatures, explore the unknown side of water, and let parents and children learn together.
Test introduction:
This experiment used DrDAQ with an external temperature probe to monitor the freezing rate of two different temperature water samples. The results of this experiment will show whether the initial temperature of the water affects its rate of freezing. Applicable to people over the age of 12, need to understand the process involved in the change of liquid state.
Required equipment:
• DrDAQ data logger is connected to the PC running PicoLog
• Two DrDAQ external temperature probes (PartNoDD100)
• Containers that can hold at least 300 ml of water
• a kettle
• A freezer
If the refrigerator is more than 2 meters from DrDAQ, you may also need one or more 5m sensor extension cables.
Experimental setup:
The experiment can be run in one of two ways: one or two samples can be frozen and tested at different times. However, it is necessary to ensure that the conditions such as the volume of water, the size of the container, and the freezing temperature of the freezer must be the same except for the starting temperature of the water. 2. Two samples can be placed in the refrigerator at the same time. Other conditions such as the volume of water and the size of the container must be the same except for the initial temperature of the water. This requires two external sensor connectors.
Monitor a single sample
1. Pour 200 ml of tap water into the container. The more water you use, the longer the experiment will take, and the amount of sample set in the next step will remain the same.
2. Insert the external temperature probe into the water.
3. Make sure that the temperature probe does not touch the side of the container and is completely submerged in the water.
4. Start running the PicoLog software and check if the temperature reading is reasonable.
5. Configure PicoLog to record samples of 2000 samples every 15 seconds.
6. Place the sample in the refrigerator and carefully route the temperature sensor cable from the edge of the door without pulling the sensor out of the cup.
7. When repeating this experiment for other samples, it is important to use the same amount of water, the same container and the same refrigerator.
Monitor two samples
1. Add water to the two containers, one with 200 ml of tap water and the other with 200 ml of heated water (about 40 ° C). The more water used in the experiment, the longer the experiment takes, and the amount of water in the two containers should be consistent.
2. Insert an external temperature probe into each container. Make sure the temperature probe does not touch the side of any container and is completely submerged in water
3. Make sure each channel is named a different name to avoid data confusion.
4. Start running the PicoLog software and check that the two temperature readings are reasonable.
5. Configure PicoLog to record samples of 2000 samples every 15 seconds.
6. Place the sample in the refrigerator and carefully route the cable from the temperature sensor out of the door without pulling the sensor out of the container.
conduct experiment
Start PicoLog to collect data and display the recorded data using the graphics function in PicoLog. Check to make sure the temperature of the sample begins to drop. Once the temperature of the two samples is homogenized, this experiment will be completed.
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