Did humans ever have gills? Our Voice. Fish can’t talk, but they do have gills—and that’s where our voices come from. Just like fish, human embryos have gill arches (bony loops in the embryo’s neck). Those gill arches become the bones of your lower jaw, middle ear, and voice box. Why can humans not breathe […]
What are the 7 base units?
What are the 7 base units? The seven SI base units, which are comprised of: Length – meter (m) Time – second (s) Amount of substance – mole (mole) Electric current – ampere (A) Temperature – kelvin (K) Luminous intensity – candela (cd) Mass – kilogram (kg) What are the three basic units? The three […]
What type of reaction is 2Na 2h20 2NaOH H2?
What type of reaction is 2Na 2h20 2NaOH H2? redox reaction What type of reaction is Na HOH? A colourless solution is formed, consisting of strongly alkalic sodium hydroxide (caustic soda) and hydrogen gas. This is an exothermic reaction. What type of reaction is this C O2 –> CO2? Another special type of combination reaction […]
Why is Mn so flat?
Why is Mn so flat? Minnesota is flat because much of it was leveled by glaciers. In the last Ice Age, ending about 12,000 years ago, glaciers rumbled down the state, flattening out the topography. Parts of northwestern Minnesota are characterized by volcanic rock, formed by lava during the Midcontinental Rift 1.1 billion years ago. […]
What are the 10 major hardware components of a computer system?
What are the 10 major hardware components of a computer system? The 10 Major Hardware Components Of A Computer System And How You Should Handle Them The Motherboard. Central Processing Unit (CPU) Monitor/ Display Screen. The Keyboard. The Mouse – Pointing Device. Random Access Memory (RAM) Read-only memory (ROM) Printers and plotters. What are the […]
Do Chemical Engineers take thermodynamics?
Do Chemical Engineers take thermodynamics? Most chemical engineering undergraduate curriculums require a two course sequence of thermodynamics. The first course generally focuses on the application of mass, energy and entropy balances to chemical and engineering processes. Is Chemical Engineering Thermodynamics hard? Chemical Engineering is not difficult to understand but sometimes is very involved due to […]
What kind of error is human error?
What kind of error is human error? Human error is an unintentional action or decision. Violations are intentional failures – deliberately doing the wrong thing. There are three types of human error: slips and lapses (skill-based errors), and mistakes. These types of human error can happen to even the most experienced and well-trained person. How […]
Why is the surface wave the most dangerous and the most destructive?
Why is the surface wave the most dangerous and the most destructive? Surface waves – By a property called dispersion, surface waves of different wave lengths travel at different velocities. It is the surface waves which cause most property damage because surface waves produce more ground movement and travel more slowly, so they take longer […]
What level of vacuum do most manufacturers recommend to remove air and moisture from a system?
What level of vacuum do most manufacturers recommend to remove air and moisture from a system? AC/R system manufacturers have individual specifications for the recommended vacuum prior to charging. However, it is generally considered good practice to evacuate a system to below 1,000 microns. After isolation, the system should not rise above 2,500 microns within […]
What could be the unit use the measure the temperature?
What could be the unit use the measure the temperature? Celsius What is the basic principle of a thermometer? The operating principle of a thermometer is quite simple. A known measure of liquid (mercury, alcohol, or a hydrocarbon-based fluid) is vacuum-sealed in a glass tube. The liquid expands or contracts when air is heated or […]