Explian why a needle floats in water? Give a scientific reason to earn points.
Keep In Mind that a soap molecule is long with one end attracted to oil molecules
and that one end of a soap molecule is polar, and the other end is nonpolar. Soap will dssolve , and the soap molecules will float freely in water. And a sewing needle will rest upon the surface of water. If powderered laundry detergent is gently spinkeld near the needle, the needle will eventually sink.
2006-09-26 02:19:46 · 8 answers · asked by Zman 1 in Science & Mathematics ➔ Biology
The needle floats because of what is called surface tension. The molecules at the surface of the water pull on each other. That holds them together, somewhat as if a thin sheet of rubber is stretched across the surface. The weight of the needle causes the surface film to bulge downward. The water pushes up on the bulge just as it pushes up on a boat. It is a combination of the water pushing up and the strength of the surface film that holds up the needle.
2006-09-26 02:21:43 · answer #1 · answered by Anonymous · 3⤊ 0⤋
It is simply due to the surface-tension of the water, the same reason that some beetles etc. can walk on water. The surface-tension of water follows from the fact that water is strongly polar
Soap Will terminate this surface-tension, and thereby causing the needle to sink
2006-09-26 02:26:06 · answer #2 · answered by Jens F 2 · 1⤊ 0⤋
A needle floats in water when, it displaces an amount of water equal to it's own wieght; thus not all needles would float. A pine needle would a lead needle would not.
2006-09-26 02:24:01 · answer #3 · answered by Grev 4 · 0⤊ 1⤋
Surface tension of water
2006-09-26 02:21:57 · answer #4 · answered by Up your Maslow 4 · 2⤊ 2⤋
Surface tension.
2006-09-26 02:22:52 · answer #5 · answered by J.SWAMY I ఇ జ స్వామి 7 · 3⤊ 0⤋
try dropping it vertically so it wont float...no surface tension resistance for pointed things but otherwise, blades, needles, etc will float as long as it's not denser than water, not on pointy position in water, capable of buoy
2006-09-26 03:10:11 · answer #6 · answered by enlightened_osiris 2 · 0⤊ 2⤋
surface tension The molecules are bonded together tightly
2006-09-26 02:21:46 · answer #7 · answered by Anonymous · 2⤊ 1⤋
im lookin at these questions, and boy, im laughin.
this world is so funny.
2006-09-26 02:31:14 · answer #8 · answered by DaWorldisbeautiful 1 · 1⤊ 5⤋