Liquids and gases are known as fluids. Fluids have various similarities and differences. Some of the basic properties of fluids are density, viscosity, temperature and pressure. In gases, the particles are moving in a random motion with high kinetic energy. In case of liquids, the kinetic ...
The first four chains -- CH4 (methane), C2H6 (ethane), C3H8 (propane) and C4H10 (butane) -- are all gases, and they boil at -161, -88, -46 and -1 degrees F, respectively (-107, -67, -43 and -18 degrees C). The chains up through C18H32 or so are all liquids at room te...
But what if we could study people from the time when they were teenagers all the way into old age to see what really keeps people happy and healthy? The Harvard Study of Adult Development did it. For 75 years, they've tracked the lives of 724 men. Studies like this are extremely rare...
What do you understand by the term diffusion of gases? Why are gas bubbles formed when a soda can is opened? How can you describe matter? Explain why gases always occupy the entire container they are in but solids and liquids do not. Biomass energy derives its energy from the sun. Briefl...
They give off a lot of greenhouse gases (温室气体)(especially CO2) into the air. This warms the earth. As a result, many animals are dying out, (A)___as penguins (企鹅)and polar bears. It will soon make a difference to us as well. (D) Sea levels will rise and many cities a...
Our bodies are exposed to natural radiation every day -- from soil and underground gases to cosmic radiation from the sun and outer space. We're also exposed to radiation from our own inventions -- medical procedures, televisions, cell phones and microwave ovens. Radiation isn't necessarily ...
However, while sulphur reduction via scrubbers is effective, their efficiency in capturing other potentially harmful gases remains uncertain. Moreover, emerging compliant fuels like highly aromatic fuels or low-sulphur blends lack characterisation and may pose risks. Over three years, we assessed ...
gases cycle separately from solids and liquids. Level 2 “cycles,” though, are primarily sequences of events rather than attempts to trace matter (i.e., more like life cycles than like scientific matter cycles). People and animals need food which they get either directly or indirectly from ...
Ideal gases are assumed to have no forces between molecules. What is the effect of attractive forces on the boiling point of a real gas? Explain why it has this effect. How does each of the following affect the rate of evaporation of a liquid in an ...
What Are Fluids? In fluid mechanics, a fluid refers to a substance that can flow and has the ability to deform under applied shear stress. It can include both liquids and gases. Fluids possess properties such as density, viscosity, and compressibility, which play significant ro...