little less daunting’ approach in education reminds me of the
child tells its parent that the teacher taught them in school to
divide two fractions by dividing the numerator by the numerator and
the denominator by the denominator. The parent rushes to school and
confronts the teacher:
can you teach your students that fractions are divided by dividing
the numerator by the numerator and the denominator by the
teacher replies: "Oh, I know that's not correct, but it's
easier for the children to remember that way."
now most of us are aware of the enormous amount of garbage exposed
on Internet. Is this the price for ‘true democracy’ of ‘unlimited’
information? How can we protect ourselves on a subject we are not
knowledgeable enough to separate a gem from the rubbish? Would a
categorization of the sources on a particular subject (i.e.
reviewing, sort of) help? By Consumer Reports ?
ago I stumbled on the dictionary of EnvironmentalChemistry.com; the
figure on the left is composed, for the citation purposes, from
several of their pages. Let me comment just on two of their
dictionary entries, ‘mass’ and ‘melting point’.
is not ‘a measurement ([sic], measure) of the quantity of
matter’; mass is a physical quantity introduced into our
description of Nature to measure inertia and as a source and subject
of the gravitational field. What is then meaning of ‘mass is not
affected by gravity’ and ‘regardless of the gravitational force
applied to it’? Mass (as a measure of inertia) is not constant;
however, at events well below the speed of light, mass could be
considered constant for all practical purposes in our everyday life.
It is in these conditions that we use mass to measure the amount of
substance, and we do so by comparing masses in Earth’s
gravitational field !
point is not ‘a point at which...’, it is ‘a temperature at
which...’. Melting is a temperature related phenomenon, yet
temperature is not mentioned in the text on the left. Maybe ‘pure
substance’ does not melt when ‘approaching’ something large
than point? Does ‘un-pure substance’ melt at all?
irony of the above described ‘information democracy’ is that
EnvironmentalChemistry.com advertises itself as an educational site.
It is their mission!
is an educational assignment: explain to someone who is ‘mass’
educated at EnvironmentalChemistry.com why light from another star
is curved around our Sun. Did you say "not to high school
student"? OK, then explain to a high school student how we are
able in our everyday life on Earth's surface to compare (weigh)
masses while 'mass is not affected by gravity' !