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  • µî·ÏÀÏ 2006-12-19 16:50
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ij·¯ºñ¾ÈÀÇ ÇØÀû 1 º¸¼Ì³ª¿ä?

°Å±â¿¡¼­ º¸Æ®¸¦ µÚÁý¾î ¾²°í ¹Ù´Ù ¹Ø¹Ù´ÚÀ» °É¾î°¡´Â Àå¸éÀÌ ÀÖ¾î¿ä.

Àú°Ô ¾î¶»°Ô Çؼ­ Àú·² ¼ö ÀÖÁö?

Àǹ®À» °¡Áö´Ù°¡ ±×°ÍÀ» ÇØ°áÇÒ ¼ö ÀÖ´Â ½ÇÇèÀ» ¹ß°ßÇ߳׿ä.

 

Ok, it's science time! °úÇÐ ½Ã°£ÀÌ´Ù.

We're going to do some experiment ½ÇÇèÀ» ÇÒ°Å¾ß  

Here are cups, tissue paper and washbowl with water. ÄÅÀ̶û ÈÞÁö ´ë¾ß°¡ ÀÖ¾î

Now put the tissue  into the cup. ÈÞÁö¸¦ ÄÅ¿¡ ³ÖÀÚ

What is in the cup? ÄÅ¿¡ ¹¹°¡ ÀÖÁö?

There is the tissue only. ÈÞÁö¸¸ ÀÖ¾î.

I'm going to sink the cup into the water just like this. ÄÅÀ» ¹°¼Ó¿¡ Áý¾î ³ÖÀ»°Å¾ß

The cup is leaning, not straight. ÄÅÀÌ ±â¿ï¾îÁ® ÀÖ¾î. ¶È¹Ù·Î°¡ ¾Æ´Ï¾ß

What will happen to the tissue? ÈÞÁö´Â ¾î¶»°Ô µÉ±î?

Does it get wet? or still dry? Á¥À»±î? ±×´ë·Î ¸¶¸¥»óÅÂÀϱî?

Oh, it's wet. Á¥¾ú´Ù.

Now let's sink it down straight À̹ø¿£ ¶È¹Ù·Î Áý¾î ³Ö¾îº¸ÀÚ.

What will happen to the tissue? ÈÞÁö°¡ ¾î¶»°Ô µÉ±î?

Is it wet? or dry? Á¥À»±î? ¾ÈÁ¥À»±î?

Ok, let's check it out. È®ÀÎÇغ¸ÀÚ

Wow, it's still dry. Á¥Áö ¾Ê¾Ò¾î.

How could it be dry? ¾î¶»°Ô µÈ°ÅÁö?

The water couldn't get into the cup when we sank the cup down straight. ÄÅÀ» ¶È¹Ù·Î ¹° ¼Ó¿¡ Áý¾î ³ÖÀ¸¸é ¹°ÀÌ ÄÅ ¾ÈÀ¸·Î µé¾î¿ÀÁú ¸øÇß¾î.

Why not? ¿Ö ±×·²±î?

What could keep the tissue from the water? ¹½ ¶§¹®¿¡ ÈÞÁö°¡ Á¥Áö ¾ÊÀ» ¼ö ÀÖ¾úÀ»±î?

Is there anything else in the cup without tissue? Äžȿ¡ ÈÞÁö ¸»°í ¶Ç ¹¹°¡ ÀÖÀ»±î?

What? ÀÀ?

It's an air. ¹Ù·Î °ø±â¾ß. 

When we put the cup straight up to the surface of the water, there is some air in the cup.

ÄÅÀ» ¹°À§¿¡ ¶È¹Ù·Î ¼¼¿ö³õÀ¸¸é Äžȿ¡ °ø±â°¡ ÀÖ¾î.

While we sink the cup down strait the air blocks the water not to come into the cup, so the tissue is still dry. ÄÅÀ» ¶È¹Ù·Î °¡¶ó¾ÉÈ÷¸é ±× °ø±â°¡ ¹°ÀÌ µé¾î¿À´Â °ÍÀ» ¸·´Â°Å¾ß. ±×·¡¼­ ÈÞÁö°¡ Á¥Áö ¾ÊÀ» ¼ö ÀÖ¾ú´ø°ÅÁö.

Do you understand? ¾Ë°Ú´Ï?


We have seen the movie "pirates of the Caribbean" ij·¯ºñ¾ÈÀÇ ÇØÀû ºÃÁö?

Two men walked down the bottom of the sea. µÎ ³²ÀÚ°¡ ¹Ù´Ù ¹ØÀ» °É¾î °¬¾úÀÚ³ª.

They put the boat over their heads and sank down strait so they could breathe. ¸Ó¸®À§·Î ¹è¸¦ µÚÁý¾î ¾²°í ¹Ù´å¼ÓÀ¸·Î µé¾î °¬±â ¶§¹®¿¡ ¼ûÀ» ½¯ ¼ö ÀÖ¾ú´ø°Å¾ß.

It is the same reason as this experiment. ÀÌ ½ÇÇè°ú °°Àº ¿ø¸®±¸³ª.

 

À§ ³»¿ëÀº ÄÁÅÙÃ÷ °ø¸ðÀü¿¡¼­ ¼ö»óÇϽŠ³îÀÚ (hisone)´ÔÀÇ ±ÛÀ» À籸¼ºÇÑ ³»¿ëÀÔ´Ï´Ù.


     
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