When a perfume bottle is opened, some liquid changes to gas and the fragrance spreads around the room. which sentence explains this?
a.
gases do not have a definite volume.
b.
the particles of gases are closely packed.
c.
the force of attraction between particles in gases is very high.
d.
gases are not matter.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

wavelegth as in spectrum red oygbiv

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.

the doppler effect is used by weather forecasters to measure 

moving clouds