1 – Frozen ice is less dense than liquid water. That is why ice cubes float in your drink! 2 – In fact at positive 4 °C , water is the most dense. Colder than that , and the density decreases , and also warmer than that , the density …
1 – Insulation is the material or technique used to reduce the rate at which heat is transferred. An insulator is something that does not let heat and electricity go through it easily. 2 – Materials that prevent heat from passing through them are called thermal insulators. A good thermal …
1 – When a pot of water is placed on a stove and the stove is turned on , the pan itself becomes increasingly hotter due to conduction; that is where the metal of the pot is directly in contact with the heating element. But the water inside the pot …
1 – Heat can only be transferred through three means: conduction , convection and radiation. Of these , conduction is perhaps the most common , and occurs regularly in nature. 2 – Conduction is the transfer of heat between substances that are in direct contact with each other. The better …
1 – As you stand in front of a fire holding your cold fingertips out in front of you , what do you feel? Slowly your fingers begin to warm up as they absorb the radiation coming from the fire. The infrared waves , or heat rays , leave the …
1 – When molecules of any kind of atoms get more energy in them than they had before , they move faster , and we call that “heat”. When the molecules move faster , they hit against each other and bounce apart , and so they end up further apart …
1 – The Sun is a star that is in the center of the Solar System. 2 – Light from the Sun reaches Earth in around 8 minutes. 3 – Earth orbits the Sun in 365 days. 4 – Corona is the Sun’s outer atmosphere with temperatures that range from …