Science

• Sun - is the main source of light
• Sun travels eight minutes from the space to the earth
• The color of light is white
• When it passes through prism the white light separates into 7 colors
• Night comes,moon and starts give us light
• Moon has no light of its own
• Light travels faster than sound
• Luciferin - a substance which fireflies have in their body that give off light
• Aftificial light is man made
• Non luminous - do not give off light
• Flashlights use battery cell or electricity to produce light
• Luminous objects - can emit light like clear glasses
• Light travels 300,000,000 meters per second
• Light travels on a straight line
• Light travels in air faster than water
• Reflection - it is the bouncing of light
• Refraction it is the bending of light
• Absorption - light cannot pass through
• Opaque objects - objects causing shadows
• Translucent - objects that allow light to pass through
• Transparent - allow only small light to pass through clearly and easily
• Dispersion - occurs when light passes a prism
• Band of colors you see in a rainbow is called visible spectrum
• Black and White are not colors
• Heat


  A form of energy that travels in a wave called heat wave
• Our sun is the main source of heat
• Fossil Fuel


  Comes from the remains of prehistoric plants and animals million years ago
• Steam


  Used by geothermal plants to produce electricity
• Electric devices


  Can also produce heat
• Heat energy


  Produced when the tiny particles in an object are always moving
• Thermal energy


  Energy produced by these moving particles
• Combustion


  Burning happens when oxygen combines with another substance
• Heat can be measured through degree celsius or degree fahrenheit
• 37°C


  Normal body temperature
• When heat reaches 100°C, water boils
• Heat - travels from warmer to cooler objects
• Effects of heat

  • Changes in state
  • Changes in size
  • Changes in temperature
• Temperature is used to measure hotness or coldness of an object
• Thermometer is used to measure temperature
• Conduction


  the transfer of heat in solid materials from warm materials to colder ones