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Behind the Mpemba phenomenon, a cup of cold water and a cup of hot water are placed in the freezer compartment of the refrigerator at the same time, which glass of water freezes first? "Of course the cold water froze first! "I believe that many people will not hesitate to do this.
Unfortunately, this answer is wrong. The mistake was discovered by Mpemba, a junior high school student at Magamba Middle School in Tanzania, Africa. One day in 1963, Mpemba found that the hot milk he kept in the freezer of his refrigerator froze before the cold milk of his classmates.
This puzzled him, so he immediately ran to the teacher and asked for advice. The teacher said easily, "You must be mistaken, Mpamba."
Unconvinced, Mpemba tried again, but the hot milk froze before the cold milk. One day, Dr. Osborn, Head of the Department of Physics at the University of Dar es Salaam, visited Mpemba's school. Mpemba mustered up the courage to ask the doctor his question.
Dr. Osborn said, "I can't ask you questions right away, but I promise to do this experiment myself as soon as I get back to Dar es Salaam." As a result, the doctor's experiment was exactly what Mpemba said.
As a result, this phenomenon is known as the "Mpemba phenomenon". For more than 40 years, the "Mpemba phenomenon" has been recognized as truth to this day. It doesn't end there.
In 2004, Yu Shunxi, a girl from Xiangming Middle School in Shanghai, questioned this phenomenon. Under the guidance of Huang Zengxin, a famous science and technology teacher, Yu Shunxi and two other female students began to study the Mpemba phenomenon. They use sugar, water, milk, starch, ice cream and other ingredients to collect.
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Hello classmate, this word means "arm", and it is pronounced as: Ahhh Thank you.
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The pronunciation of arm in Chinese is as homophonic as ahmu.
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arm, the meaning of arm, is pronounced as "Eminem", and Ah is the four tones.
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Ah Er Mu (Chinese to English pronunciation).
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arm eng [ɑm].
美 [ɑrm].
n.Arm; **;[plural] war; Power.
vi.Prepare (struggle), prepare for action (against) vtequipment (fortifications); Preparation (attack or attack); Equipped with; Protection [example sentence].
you're hurting my arm.
You're hurting my arm.
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Phonetic transcription: English [ɑm], American [ɑrm].
Meaning: 1, nArm; Armrest; Sleeves; **;Services.
2、vt.Arm; Equip.
Example: You should wind a cloth round the wounded arm
You should wrap a piece of cloth around the injured and arm.
Usage. 1. The basic meaning of arm as a noun is "arm", which mostly refers to human arms and arms, and can also refer to the forelimbs of animals, and also refers to various things that resemble arms.
2. The plural form of arm arms means "** (especially referring to firearms)". When used metaphorically, it can refer to "power", and a vertical circle can refer to "troops", and it cannot be accompanied by an indefinite article.
Nor can it be a numeral.
retouched. The same is true when used as a definite.
3. arms can be used in front of another noun as a rough ornament for the collapse of the remaining socks.
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1. arm English [ɑ m] American [ɑ rm], nArm; Arm; Upper limbs; Sleeves; Armrest; v.Arm; Equip. Prepare for war; Give....Attaching the fuse; Open....insurance; preparation for launch; Make (bombs, etc.) at any time**.
2. Example sentence: his collar bone only hurt when he lifted his armHis collarbone only felt pain when he raised his arm.
The pronunciation is the same, both are pronounced màn, the initials are m, the finals are an, and the tone is four. >>>More
Breeze - majestic sigh - sigh.
That is, these two words are very interesting.
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漪 is a Chinese character, pinyin yī, which means water ripples, ripples formed by the wind blowing the surface of the water, and also refers to the shore. >>>More
The extraordinary sound is the same as the nonchalant "no", which is pronounced bù (fourth tone). >>>More