科普实验英文作文

科普实验英文作文
1. Experiment 1: The Water Cycle。

In this experiment, we observed the water cycle in action. We filled a glass with water and placed a clear plastic wrap over the top. Then, we placed a small rock in the center of the plastic wrap to create a dip. We put the glass in direct sunlight and observed as the water evaporated and condensed on the plastic wrap, eventually dripping down into the dip in the center. This experiment demonstrates how water evaporates from bodies of water, condenses in the atmosphere, and falls back to the Earth as precipitation.
2. Experiment 2: Density。

For this experiment, we filled three jars with
different liquids: water, oil, and honey. We then added small objects, such as a grape and a paper clip, to each
jar and observed how they floated or sank. This experiment
showed us that objects float or sink based on their density relative to the liquid they are in. Objects with a higher density than the liquid sink, while objects with a lower density float.
3. Experiment 3: Chemical Reactions。

In this experiment, we mixed baking soda and vinegar in a clear container and observed the chemical reaction that occurred. The mixture began to bubble and release carbon dioxide gas. This experiment demonstrated how chemical reactions can occur when two or more substances are combined, resulting in the formation of new substances and often the release of energy.
4. Experiment 4: Magnetism。

For this experiment, we used a magnet to attract and repel different objects. We observed that the magnet could attract certain metals, such as iron, but not others, such as aluminum. We also observed that the magnet could repel other magnets with the same polarity. This experiment
demonstrated how magnets have the ability to attract and repel certain materials based on their magnetic properties.
5. Experiment 5: Photosynthesis。

In this experiment, we placed a leaf in a container of water and covered it with a clear plastic wrap. We then placed the container in direct sunlight and observed as bubbles began to form on the surface of the leaf. This experiment demonstrated how plants use the energy from sunlight to convert carbon dioxide and water into oxygen and glucose through the process of photosynthesis.。