Engineering

Plexiglas was discovered by Walter Bauer and Otto Rohm of the Rohm and Haas company in Germany in 1933. some people, mostly Canadians, claim that William Chalmers discovered Plexiglas at McGill University, while a graduate student. He actually worked with an inferior plastic called poly(ethyl methacrylate) at a later date. Detailed references to the history of Plexiglas are available at the following link:

https://sites.google.com/site/hjhatua

The mass of a train cart on Kingda Ka roller coaster at Six Flags Great Adventure is approximately 2,850 pounds or 1,293 kilograms.

I think at sealevel and standard conditions the partial pressure of hydrogen is nearly zero (~0 Pa).

Silt Density Index (SDI) is an empirical test

developed for measuring the rate of fouling of

nano filtration (NF) or RO membranes. It

represents the potential for fouling of the

membranes by finely suspended particles

present in feed water to the membranes.

BTU means" british thermal unit " and is a measure of energy like kWh or Joules. BTU is often used in air conditioning. Btuh or btu/hr is a measure of power like kW and is also used in air conditioning and heating applications. Often "btu" will be used in a lazy shorthand for btu/hr. MBH is shorthand for 1000 btu/hr.

Rolling friction is the resistance encountered by an object when it rolls over a surface. It is typically less than sliding friction because the object's shape allows for smoother movement. Rolling friction occurs between the object and the surface it is rolling on.

It is called, "electric current", and is measured in "Amperes".

If The amount of energy required to produce 34.5lbs/hr of steam at a pressure and temp of 0 psig and 212degree F with feed water 0 psig and 212 degree F requires 33445.6 Btu/hr of energy

ie 33445.6 Btu/hr willl produce 34.5lbs/hr

then mathematically it can be solved

Thank you,

The free electron theory assumes that electrons in a metal behave like a gas of free particles. It also assumes that these electrons are not restricted to individual atoms, can move freely through the metal lattice, and are responsible for various electrical and thermal properties of metals.

The other metal in high speed steel bi-metal machine hacksaw blades is typically a flexible material like spring steel. This combination allows the blade to maintain its hardness and cutting edge while also being flexible enough to withstand the cutting forces during use.

It would increase

The Earth receives direct sunlight at the equator, where rays of the sun strike the surface at a perpendicular angle due to the Earth's tilt. This results in more intense and direct sunlight at these regions, leading to warmer temperatures.

The way elements are ordered in the periodic table is based on their atomic number, which represents the number of protons in the nucleus of an atom. Elements are arranged in increasing order of atomic number from left to right across periods and top to bottom within groups. This arrangement helps group elements with similar properties and trends, making it easier to understand their behavior.

100,000 a year

Synthetic plastics are man-made materials that are derived from natural resources such as petroleum or natural gas. They are designed to be durable, lightweight, and versatile, making them widely used in various industries for packaging, construction, and consumer goods. However, their non-biodegradable nature poses environmental challenges due to their persistence in the environment.

There are 36,000 cfh (cubic feet per hour) in 36 mbh (thousand British thermal units per hour).

An arrangement of objects into rows and columns that form a rectangle. All rows and columns must be filled . Each row has the same number of objects and each column has the same number of objects.

-Danielle German

Grade 6

A non-living ecosystem is an environment that does not contain living organisms but is still composed of physical elements like soil, water, air, and rocks. Examples include bodies of water such as lakes or oceans, as well as geological formations like deserts or mountains. These ecosystems still play a vital role in supporting life by providing essential resources and habitats for living organisms.

Mighty Putty is a versatile epoxy putty that can be used for many household repairs. It is known for its strength and durability when properly applied. However, as with any product, results may vary based on the application and surface being repaired.

The main components in stainless steel are iron and nickel, for different grades or types of stainless steel there are other components added as well in order for it to meet particular standards.

In metallurgy, stainless steel, is also known as inox steel, or inox.

Calcite is used in the industrial world for various applications such as in the production of cement, as a filler in paint and plastics, as a soil conditioner in agriculture, and as a flux in the production of iron and steel. It is also used in the manufacturing of glass, paper, and ceramics.

A vapor pressure thermometer is a device that measures temperature by detecting the pressure of a vapor in a closed chamber. As temperature increases, the pressure of the vapor also rises, allowing for temperature measurement. These thermometers are often used in scientific and industrial applications where precise temperature control is necessary.

There are two methods for weighing airplanes. The first is to actually put the airplane on a set of scales, one under each wheel, and determine the weight that way. The other, common for large aircraft, is to calculate the weight. When a new aircraft is certified by the FAA, it is actually weighed at the factory and an empty weight is determined for each model. The aircraft weight is then recalculated for any changes made to that model. When an airline buys a fleet of the same model aircraft, it determines a basic operating weight (BOW) for the fleet. BOW is the empty weight of the aircraft with the weight of normal operational stores added. These include such items oil and other fluids, spare parts, galley stores, emergency equipment, normal crew, etc...basically, everything except fuel, passengers and cargo. When an aircraft is ready for a flight, its weight is determined by starting with the BOW and adding the actual weight of everything that has been added to the aircraft for that flight. These normally include the actual fuel load, the weight of the passengers (either actual weights if the flight is critical, or average weights if not), the actual or average weight of bags, and the actual weight of the cargo. The end result is the aircraft take-off gross weight (TOGW), which is then used to determine the expected performance of the aircraft (how high it will be able to fly, how fast, etc.). The en route fuel burn is calculated and then subtracted from the TOGW to get landing weight which is used to determine landing performance (how much runway will be needed, stopping distance, etc). Hope that helps.

Plants participate in the water cycle through a process called transpiration, where they release water vapor through pores in their leaves. This water vapor eventually condenses into clouds and falls back to the Earth's surface as precipitation. Plants also help in water absorption and soil infiltration, contributing to groundwater recharge.

Low density polyethylene (LDPE), a thermoplastic made from oil. The product is: * Light-weight

* Good impact resistance

* Extremely flexible

* Easily cleaned

* Thermoforming performance

* Meets food handling guidelines

* No moisture absorption

* Chemical-and corrosion-resistant