Physical Chemistry 2 min read
The Maxwell–Boltzmann distribution of energies
If no heat was distributed, then our faces and those parts closest to the fire We often see this relationship…
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← Explore all topics Physical Chemistry 2 min read
Motion of particles in the gas phase
The question, ‘What is pressure?’ is another odd question, but is not too difficult to answer. The constituent particles of…
Physical Chemistry 3 min read
The ideal-gas equation
A bubble-jet printer is one of the more useful and versatile inventions of the last decade. The active component of…
Physical Chemistry 4 min read
The effects of temperature on density
The air around a hot radiator soon acquires heat. We explain this observation from the ‘minus oneth law of thermodynamics’…
Physical Chemistry 3 min read
‘The material of action so variable’
The classical author Epictetus (ca 50–ca 138 AD) once said, ‘The materials of action are variable, but the use we…
Physical Chemistry 3 min read
How fast is ‘greased lightning’?
In comic books of the 1950s, one of the favourite phrases of super-heroes such as Superman was ‘greased lightning!’ The…
Physical Chemistry 3 min read
The SI unit of length
A common problem in Anglo Saxon England, as well as much of contemporary Europe, was the way cloth merchants could…
Physical Chemistry 4 min read
The practice of thermodynamic measurement
Although the answer to the simple question ‘what is temperature?’ seems obvious at first sight, it is surprisingly difficult to…
Physical Chemistry 3 min read
Thermal equilibrium and the zeroth law of thermodynamics
A fever is often the first visible sign of someone developing an The word ‘thermometer’ has two roots: meter denotes…
Physical Chemistry 3 min read
Laws and the minus-oneth law of thermodynamics
Feeling the temperature of a radiator is one of the simplest of A ‘law’ in physical chemistry relates to a…
Physical Chemistry 3 min read
Observed and controlled variables
We want to turn up the radio because it’s noisy outside, and we want to hear what is broadcast. We…
Physical Chemistry 3 min read
Relationships between variables
The pressure p of the air above any point on the Earth’s surface relates ultimately to the amount of air…