Replacing the old furnace in your central heating system with a new, more efficient model can offset volatile energy prices. Money aside, today's furnaces pollute less and boost comfort by producing heat more steadily than older furnaces. Gas is the most common heating fuel and this report focuses on gas furnaces.fficiency also matters. Gas is currently the most common heating fuel and most new central-heating systems use gas. How efficiently a furnace converts gas into heating energy is reflected in its annual fuel-utilization-efficiency (AFUE) rating, which is measured as a percentage.
Plant cells have chloroplasts where photosynthesis takes place. Plant cell vacuoles tend to be larger than in animal cells. The plant's vacuoles regulate turgor pressure of the cell. Turgor pressure is the pressure exerted on a plant cell wall by water passing into the cells.
Both plant and animal cells are eukaryotic cells, i.e., they have complex structures but the structures of both types of cells have major differences. Animal cells do not have rigid cell walls like plant cells. This allows animal cells to form and adopt various shapes. A type of animal cell called the phagocytic cell can even absorb other structures. This ability is not inherent in plant cells. Further, unlike animal cells, plant cells have chloroplasts for the utilization of sunlight and this is what also gives plant cells their green color.