NCERT Science 1st Chapter
(MATTER IN OUR SURROUNDINGS)
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Here we mention what the chapter contains:
1.1.1 MATTER IS MADE UP OF PARTICLES
For a long time, two schools of thought prevailed
regarding the nature of matter. One school
believed matter to be continuous like a block
of wood, whereas, the other thought that matter
was made up of particles like sand. Let us
perform an activity to decide about the nature
of matter – is it continuous or particulate?................. continue....
1.2.1 PARTICLES OF MATTER HAVE SPACE
BETWEEN THEM
In activities 1.1 and 1.2 we saw that particles
of sugar, salt, Dettol, or potassium
permanganate got evenly distributed in water.
Similarly, when we make tea, coffee or
lemonade (nimbu paani ), particles of one type
of matter get into the spaces between particles
of the other. This shows that there is enough
space between particles of matter...............continues
1.5.2 HOW DOES EVAPORATION CAUSE
COOLING?
In an open vessel, the liquid keeps on
evaporating. The particles of liquid absorb
energy from the surrounding to regain the
energy lost during evaporation. This
absorption of energy from the surroundings
make the surroundings cold.........continue............
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