delta, definition of

Physics. the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.

Often encountered by people the most when heating a home, as the heat rises to the ceiling. The opposite effect, cooling, can be observed near windows on a cold night, the windows cool the air and it drops. Therefore convection often causes drastic heat loss close to windows. If not dealt with (by the usage of curtains or double glazing usually) this can contribute greatly to heating and cooling costs, as in Summer you will get the opposite effect of heat easily entering the property from the outside via the glass & convection.

• California revives multibillion-dollar Delta tunnel project
  California Governor Gavin Newsom revived plans to construct the controversial Delta tunnel water project. On Wednesday, the state unveiled a downsized version of the original proposal.[...]
• 5 surprising products made from hemp
  Hemp is a sustainable supermaterial with a wide range of applications that go far beyond hacky sacks and beaded bracelets. An experimental project called Fabric-Action explores exciting new uses for hemp - including modular gardens, skateboards, swings,...
• PHOTOS: Living the Green Life at an ‘Echo Village’ Immersed in Buenos Aires’ Delta
  Upon arriving, it's difficult to believe that you're still in Buenos Aires. But it takes just 1 hour by train, 45 minutes by boat, and a short 5 minute walk through a green tunnel, you'll find yourself at the doorstep of the Echo Village. Immersed in...
• Yeah, we’ll get right on that…
  From Inderscience Publishers , a shocking revelation. People actually go to Botswana. Though, maybe they’ve been jealous of the Maldives and Tuvalu getting all the attention and handouts for non-existent climate threats. The Maldives formula is...
• Flanders fearful flooded fields
  From the University of British Columbia,  David Flanders is trying to scare Canadians over sea level rise. Only one problem, the math doesn’t work. Preparing for the flood: Visualizations help communities plan for sea-level rise Researchers at...
• Delta Helicopters Developing World’s First Biofuel-Capable Helicopter
  Plenty of airlines are testing out biofuels in passenger jets, but helicopters have largely been ignored — until now. Australia-based Delta Helicopters is developing what it says is the first biofuel-capable diesel helicopter in the world. Dubbed...