Heat and Energy

Heat is the internal energy

Heat is the internal energy of molecules in a substance and flows from hot bodies to cold bodies. Temperature determines the direction of heat flow an

Water contracts when heated from 0°C

Water contracts when heated from 0°C to 4°C (instead of expanding) and expands when cooled from 4°C to 0°C. Water has maximum density at 4°C (1000 kg/

Energy flows linearly from sun

Energy flows linearly from sun to producers (plants) through photosynthesis, then to primary consumers (herbivores), secondary consumers (small carniv

Sources that can be replenished naturally

Sources that can be replenished naturally and won't get exhausted: solar energy, wind energy, hydro energy, biomass, tidal energy, geothermal energy,

Sources formed over millions of years

Sources formed over millions of years that will get exhausted with use: coal, petroleum, and natural gas (fossil fuels). These are conventional source