Category: Physics

What is the weight of 1 cubic foot of air? 0.0807 lbs. Do air has weight? Air does, in fact, have weight, and here’s a simple way you can prove it. You’ll need two identical balloons, a string, and a dowel. The side with the inflated balloon hangs lower than the other side. You have […]

Which is better crystalline or amorphous? Amorphous has better indoor performance compared to crystalline (in one test we conducted amorphous outperformed crystalline by 4x) and we are constantly taking additional steps to make the material even better indoors. Which brand solar panel is the best? Out of all the companies currently making solar panels, the […]

Why does a free to move piston hold a constant pressure in the cylinder? The piston is free to move and the atmospheric pressure on the outside is constant. If energy is transferred into the system as heat, the energy only has one place to go, into the kinetic energy of the gas, making it […]

What are examples of a design constraint? Design constraints are limits placed on design. An obvious example is budget. Another is screen size. A less obvious example is a designer’s skill level. What are constraints examples? The definition of a constraint is something that imposes a limit or restriction or that prevents something from occurring. […]

Is steel a soft or hard magnetic material? The Use of Steel in Permanent Magnets Going back to the basics of this metal, steel is an alloy consisting of iron and carbon. In its natural state, steel isn’t magnetic, but it can be modified in a way that turns it magnetic. What are soft and […]

Is Fibreglass insulation still used? ‘Fibreglass loft insulation was invented in 1947 and the chances are that because you live in an old house you have it in your roof. It is now obsolete and inefficient, so the government are advising people to have it replaced with new modern insulation. Is fiberglass a good electrical […]

How does a white dwarf die? A main sequence star that lacks the mass necessary to explode in a supernova will become a white dwarf, a ‘dead’ star that has burned through all of its hydrogen and helium fuel. But the white dwarf remains hot for some time, much like a stove burner still emits […]

Are all levees man made? Levees can be natural or man-made. A natural levee is formed when sediment settles on the river bank, raising the level of the land around the river. To construct a man-made levee, workers pile dirt or concrete along the river banks (or parallel to any body of water that may […]

Why is England not a country? Just like Wales and Scotland, England is commonly referred to as a country but it is not a sovereign state. It is the largest country within the United Kingdom both by landmass and population, has taken a pivitol role in the creation of the UK, and its capital London […]

How do you explain fact and opinion? A fact is a statement that can be proven true or false. An opinion is an expression of a person’s feelings that cannot be proven. Opinions can be based on facts or emotions and sometimes they are meant to deliberately mislead others. What is a fact ks1? Facts […]