Definitions [4]
Define High pressure
High pressure is an area of the atmosphere where the barometric pressure is higher than its surrounding areas. In this case, the wind from the center of high pressure blows towards the surrounding low-pressure areas.
Define Low pressure.
A low-pressure area is an area in the atmosphere where the pressure is lower than its surrounding areas. In this situation, the wind from the surroundings blows towards the center of low pressure.
Define one atmosphere.
The pressure exerted by this mercury column is considered as the pressure of magnitude ‘one atmosphere’ (1 atm).
The atoms of the same element, having same atomic number Z, but different mass number A, are called isotopes.
OR
Atoms having the same atomic number (Z) but different mass numbers (A).
Key Points
Isotopes are atoms of the same element that have the same atomic number but different mass numbers (different number of neutrons).
Same in isotopes:
- Atomic number (Z)
- Number of protons and electrons
- Electronic configuration
- Position in periodic table
- Chemical properties (nearly identical)
Different in isotopes:
- Mass number (A)
- Number of neutrons
- Physical properties
Examples: \[_1H^1and_1H^2\]
