Preparation materials: plastic bottles, scissors.
1. Find a plastic bottle and cut it in the middle.
2. Make a hole in the bottle cap, and then buckle the upper part upside down on the lower part.
3. Pour a certain amount of water into the top.
Let the water flow for one minute and make a mark on the water.
5. Pour out the water below and pour a certain amount of water on it later.
Use of timer
1, Time Management: Timers can help people manage time, improve efficiency and organize work. No matter in study, work or daily life, by setting a timer, people can arrange time as planned to remind themselves to complete tasks or activities within the specified time.
2, kitchen cooking: in the cooking process, the timer is the chef's right-hand man. By setting the timer, you can accurately calculate the cooking time, ensure the cooking time and maturity of food, and avoid overcooking or burning food.
3. Fitness and sports: Timers also play an important role in the field of fitness and sports. For example, athletes can use timers to calculate their running time, swimming time or the duration of other events. In addition, in fitness training, the timer can help people to arrange and control different exercise and rest time to ensure the effectiveness of training.
4. Games and competitions: In games and competitions, timers are used to calculate and record the time taken by participants to complete tasks, clear customs or win. It can help evaluate the performance of participants and provide fair timing standards.
5. Experiment and scientific research: In laboratory and scientific research, timers are used to measure and record the time of various physical, chemical or biological processes. It can help scientists and researchers accurately measure experimental results and data and promote scientific research and discovery.
Timer plays an important role in time management, cooking, fitness, games and scientific research. It helps people to accurately measure and calculate time, improve efficiency and ensure the smooth progress of activities and tasks.