Nine-volt battery batteries were formerly made in this size. They had higher capacity than the then-standard carbon-zinc types, a nominal voltage of 8.4 volts, and very stable voltage. Once used in photographic and measuring instruments or long-life applications, they are no longer manufactured as mercury is highly toxic and accumulates in the ecosystem, posing a risk to humans and wildlife. Most battery voltage testers and chargers that can also test nine-volt need another snap clip to hold the battery, while cylindrical batteries often share a holder that may be adjustable in size. Because of the proximity of the positive and negative terminals
Toxic colonialism term may also be applied to exploitation of Native American reservations, where differing environment regulations allow the land to be more easily used for dump sites. It is important to distinguish the difference between toxic colonialism and environmental racism. Toxic colonialism is the practice of targeting poor communities of color in developing nations for waste disposal and/or experimentation with risky technologies. Environmental racism is the inequitable distribution of environmental hazards based on race. In other words, toxic colonialism can be seen as “micro” as it focuses on a specific area or group of people. Environmental racism can be seen as