What is the constoshon?

When you measure how hot or cold matter is you measure? Can forces change an object motiin? Do objects have to be touching each other to exert electrical force? How does friction reduce speed? Where is the optical center of a bifocal lens? How many grams are in 4 grams? How much work is done by a weight lifter when he holds a weight of 80Kg on his shoulders for two minutes? What does kg mean in measurements? How is heat transferred in the mesosphere? What temperature is equal to 20 kelvin? What does it mean obsorbed? What is a resource that humans use to produce energy called? Explain why a bottle of milk keeps better when it stands in water in a porous pot in a draught? Compressed springs and streched rubber bands are stored what energy? What is the tendency for a material to oppose the electron flow and change electrical energy in to thermal energy and light? Why do igloos not melt if they have fire inside? Which phrase describes velocity? What does momentom mean? How wind is captured in a wind turbines? Why does refrigerant pressure decrease in a refrigerant cylinder while charging with vapor?