What are some efficient ways to save energy? give at least 5 ways.

 -Dust or vacuum radiator surfaces frequently. Dust and grime impede the flow of heat. 
-Keep lamps, TVs and other electrical appliances away from the thermostat. Heat from these appliances is sensed by the thermostat and could cause your furnace to shut off too soon and restart frequently.
-Keep garage doors closed in winter. An open garage door is just a giant hole that sucks warm air out of your home and lets cold drafts in.
-Repair dripping faucets promptly. If the faucet leaks hot water, the energy used to heat it is costing you money. (One drop a second can waste up to 48 gallons a week!)
-  Use Energy Star LED or compact fluorescent light bulbs. Energy Star light bulbs last longer and use up to 80 percent less energy than standard light bulbs.

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.

Higher temperature = molecules move around faster. and vice versa.