Asked by | 14th Jun, 2009, 01:08: PM
1. (1) relative density : hygrometer
Note- Hygrometer is used to measure the relative humidity of the sir.
2. (2)radioactivitywas discovered by Madam Curie
Note - Radioactivity was discovered by Antonie Henri Becquerel in 1986.
Answered by | 14th Jun, 2009, 02:28: PM
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