Saturday, 10 January 2015

Science for kids - detergent powered boats

This is an easy one, assuming you occasionally clean your dishes. You just need some bread ties, water and detergent. The video is a little unimpressive, but you could dress the bread ties up to make them look like boats.

Essentially, the detergent is breaking the surface tension of the water, and if you break the surface tension behind the bread tie, the tension in front of the tie pulls it forward. Detergents are surfactants, which means they have a polar end (which is attracted to water) and a non-polar end (which is attracted to oil and grease). This is how detergents (and soaps) bond to both oil and water and hence wash your dishes. Water, without detergent, has a strong surface tension, which is created by the water molecules bonding to each other through Hydrogen bonds. The polar end of the detergent breaks the water surface tension by interfering with the hydrogen bonds at the surface - interestingly, the non-polar ends of the detergent, being hydrophobic, stick up into the air.


  1. Great work man i would like to congratulate you on this effort

  2. 현재 리본성먹튀에 대해 검증하고있습니다 리본먹튀 리본성양방 리본성주소 리본성검증 먹튀나라넷이 완벽 분석해드리겠습니다

  3. DREAMY-메이저사이트인 토토사이트와 안전놀이터 배팅사이트 추천 안전함이 최우선으로 보장되고 있는 토토사이트의 메이저사이트를 드리미가 추천합니다 강한 토토사이트를 사설토토사이트에서 메이저놀이터로 즐기실 수 있는 최고의 안전놀이터 추천을 경험하십시오 사설 토토.