Scientific methods of water use. Composition. About 500 words

Life is a long journey, and there will always be many stumbling blocks scattered on the ground, making our path forward extremely difficult, but as long as we are not defeated by these stumbling blocks, they may become our stepping stones to success. Marie Curie went through countless failures, but finally found the radioactive element radium, and she taught us that great success comes from failure.

It's the gold in my life.

Standing on the track, I looked ahead confidently and seemed to be able to win the championship without much effort. When it was time to start the race, the runners were on the starting line, and I was on my own track, and I was the first to cross the finish line during training at school yesterday, and I was ready to start the race with a smile on my face.

After a gunshot, the PE teacher's advice rang in my ears: "Don't use all your strength at the beginning, save your strength, and sprint to the end." I smiled disdainfully, thinking:

The number one position, I won't give it up. How can they surpass me? I ran forward as I did to the first, and gradually my arms did not swing as fast as before, my breathing became more rapid, my legs were not as strong as they had just been, and I regretted the sneering expressions of my opponents as they overtook me.

In the end, I could only watch as a few runners had already crossed the finish line before me.

After the finish line, I sat down on the side of the track. "Why don't you do what the teacher says? This consequence is all my own doing.

I blamed myself. My good friends at the same school helped me up and took me aside to comfort me. I didn't say a word because I understood that this failure was the result of my arrogance and not humbly listening to my teacher's opinion.

If I had trained more and did what the teacher said, the result would have been completely different, and I made up my mind to remember the lesson and try to get good results next time.

My teachers and classmates thought that this failure would leave a scar on my heart, but I trained harder and listened to my teacher's teachings. Every time I train, I use the lesson of that failure to warn myself: you can't go your own way, and you have to listen to the right opinions of others with an open mind.

My speed has also increased again and again. Everyone was amazed at how much progress I had made, and it was because of that defeat that I turned my defeat into success in the second competition and won the championship medal. Looking at the shining light of that medal, I knew that it was the failure that brought me.

Failure is an indispensable asset, and it is always a reminder of how to make myself better. Failure is the gold in my life, it allows me to understand the reasons for my mistakes, so that I can make greater progress and bring me success.

Domestic water is the most widely used in home life. Depending on the steps of life, we can adopt different methods of water use. 1. Laundry.

Modern homes mostly use washing machines to wash clothes. For light, thin, and easy-to-wash clothes, please try to wash them by hand, which can save a lot of water; The waste water generated in the process of washing clothes should not be poured out in vain, it can be stored, the dirty water is used to flush the toilet, and finally the clean water used to wash clothes can be used to mop the floor. In addition, ordinary laundry detergent contains phosphorus, and phosphorus in the sewage treatment process, can not be removed, will be discharged into the river with sewage, some rivers in our province part of the total phosphorus exceeds the standard (such as the upper reaches of the Sun River in Xinglong Overseas Chinese Tourist Resort), it is due to the phosphorus in the washing products.

Excessive phosphorus content in water bodies can easily lead to eutrophication of water bodies. Use bleach sparingly, as bleach contains chlorine. 2. Clean the kitchenware.

Kitchen utensils such as dishes and chopsticks usually absorb a large amount of edible oil and various condiments, and the oil stains on the kitchenware can be wiped dry with old paper before cleaning, and the paper stained with oil can be disposed of as fixed garbage.

An interesting experiment.

Once, I was eating an egg when I suddenly had an idea: Can I write on the egg? So I hurried to ask my father as if I had discovered a new world

Dad, can you write in the egg? "Absolutely! Dad said suspiciously.

Can you teach me how to write? I asked ...... urgently

I excitedly ran to the kitchen to ......

I took out an egg, washed it, and then carefully dried it; Then he took a brush dipped in sour vinegar and wrote the word "Song" on the eggshell, and then put the egg in the air for a while, because according to Dad, he had to wait until the vinegar evaporated. I saw that the time was almost up, and put the eggs in the pot - boiling. A minute passed, and I took out the egg, "Hey, why isn't it cooked yet!"

Time flies! I reluctantly put it back in the pot. Two minutes, three minutes passed, and I couldn't wait to take out the eggs, "Haha, cooked!"

I smug myself to myself. The egg was put into cold water by me, waiting to cool, and I stared intently at the egg, the fruit of my labor. Fifty seconds passed, and I excitedly peeled the egg and looked at the white and smooth body, "Oh my God!

The song I wrote on the eggshell was actually printed on the egg. I said in surprise. However, this experiment still puzzled me.

Holding this unusual egg, I rushed into the study with doubts, turned on the computer ......It turns out that after acetic acid dissolves the eggshell, it can also dissolve a small amount of protein, and the protein has an amino acid group, which will be hydrolyzed under acidic conditions, showing blue or purple. "I see! It really made my mouth start!

From this experiment, I understand that in fact, in daily life, as long as we observe carefully, we will find many interesting things, and if we can put them into action, we can also gain more knowledge, wouldn't it kill two birds with one stone!

I often go home to read the lyrics of Chen Hong.

Everyone may discover some mystery of something, and there will be many experiences in the process of discovery, of course, even I, a person who does not like to discover, will discover the mystery of things, if you don't believe it, please listen carefully.

It was ...... on a hot and cool summer day

My sister and I were playing by the pond. Suddenly, a small red fish jumped out, a graceful dolphin-style diving action, with water droplets like a naughty child landed on the lotus leaf, rolled, turned over, and jumped up again, a flawless diving action was born.

I think that the lotus leaf must have been wet with water droplets, and the lotus leaf has no towel, so it is easy to catch a cold, and it can't take medicine. I dried it to give it a chance to sunbathe. So, I dragged the lotus leaves out of the pond with my own mopping floors.

Touch the lotus leaf with your hand, well, fluffy, and the texture is not bad. Take a closer look, huh? How did you do it?

I didn't believe it, so I put the lotus leaves in the pond and soaked for a while, and when I picked it up, it was still dry. Is it that the lotus leaf is too hot, and when it is hot, it will be thirsty; When you're thirsty, you want to drink water, so you swallow it, right? It must be like this.

I would like to see how lotus leaves can drink water without a mouth. So, I didn't care if the lotus leaf felt cold or not, and let it soak for a while. This time, I watched with excitement with wide eyes, and my heart was still beating "thump" from time to time, for fear of missing the scene where the water droplets were eaten by lotus leaves.

However, it backfired, and the water droplets were not eaten by the lotus leaves, but "bounced" into the water like marbles.

Why don't lotus leaves get wet? "I walked into the study with questions and opened '100,000 Whys'. A check, oh, it turned out that there was a nano film composed of nanometers on the surface of the lotus leaf.

The nano film is spread on the surface of the lotus leaf, making the lotus leaf smooth, as if putting on a waterproof coat for the lotus leaf.

Interesting science class In the last science class, the teacher gave us an assignment and asked each student to prepare a thing, which is a seasoning for cooking, drinks and milk, boiled water, tap water, sugar, etc., and the students wondered, "What are you going to do with these things?" The bell rang for the end of class, and the students guessed. I was also waiting for the next science lesson with this curious question.

This afternoon, the first period was science class, and the students took out the prepared things and waited for the teacher to come to class. I thought: this lesson must be interesting.

Brought. "Today, the teacher is going to ask you to do an interesting experiment, first of all, you take out the prepared boiled water, see what color the boiled water is, and then smell it?" Finally, taste what it tastes like.

After reading, smelling, and tasting, the students all raised their hands to answer the teacher's questions. Next, the teacher asked the students to take out the prepared spices, sugar, milk, and drinks, and put them in boiled water to see what changes. The students scrambled to answer

It became milky. "It's turned red. "It's brown.

…"Can you taste what it tastes like? The students picked up the water cups and tasted them, and the students who put in the sugar, milk, and drinks all drank it in large gulps. Among the students who put in all kinds of spices, some of them pinched their noses with their hands before the water cup reached their mouths, and some stuck out their tongues, grinned and squinted ...... after drinking a littleLooking painful, the teacher and classmates laughed.

At the end, the teacher asked them to say how they felt. Throughout the class, the students learned knowledge in a happy way. What a fun science lesson!

Scientific use of water ≠ water conservation.

Water conservation also "saves" health.

In order to save water bills, some citizens take a water tank or a plastic bucket to store and use the drip water on a fixed faucet for a long time. Only when the water heater is turned on to take a shower, only turn on the key to boil the faucet with water, usually wash vegetables, cook, wash clothes, etc.

But from the perspective of human health, this method of water use is not advisable, because after the tap water is sterilized by liquid chlorine, the bacteria and coliform bacteria in the water are killed, but there are still very few residual microorganisms in the water, when the water consumption of a certain branch water pipe is small, the water stays in the pipe for a long time, and the residual chlorine of sterilization is reduced or even disappeared, that is to say, there is not enough residual chlorine in the tap water to supplement the sterilization, and the few remaining microorganisms in the water will breed new bacteria with the very little organic matter in the water as nutrients, resulting in secondary pollution of tap water quality. Affects water quality. Long-term drinking and storage of water is very detrimental to people's health. Therefore, drinking fresh tap water that maintains a certain flow rate is scientific drinking water.

There's also relevant knowledge here.