The process by which a solid changes directly to a gas without first becoming a liquid is called **Sublimation**.

Here’s the step-by-step reasoning:

1. **Melting**: This is the process where a solid changes to a liquid. It does not involve a direct change to a gas.
2. **Boiling**: This is the process where a liquid changes to a gas. It does not involve a solid changing directly to a gas.
3. **Evaporation**: This is the process where a liquid changes to a gas at temperatures below its boiling point. It does not involve a solid changing directly to a gas.
4. **Sublimation**: This is the process where a solid changes directly to a gas without passing through the liquid state.

Therefore, the correct answer is **Sublimation**.

Question

The process by which a solid changes directly to a gas without first becoming a liquid is called **Sublimation**.

Here’s the step-by-step reasoning:

1. **Melting**: This is the process where a solid changes to a liquid. It does not involve a direct change to a gas.
2. **Boiling**: This is the process where a liquid changes to a gas. It does not involve a solid changing directly to a gas.
3. **Evaporation**: This is the process where a liquid changes to a gas at temperatures below its boiling point. It does not involve a solid changing directly to a gas.
4. **Sublimation**: This is the process where a solid changes directly to a gas without passing through the liquid state.

Therefore, the correct answer is **Sublimation**.

Knowee AI · Accepted Answer

The process by which a solid changes directly to a gas without first becoming a liquid is called **Sublimation**.

Here’s the step-by-step reasoning:

1. **Melting**: This is the process where a solid changes to a liquid. It does not involve a direct change to a gas.
2. **Boiling**: This is the process where a liquid changes to a gas. It does not involve a solid changing directly to a gas.
3. **Evaporation**: This is the process where a liquid changes to a gas at temperatures below its boiling point. It does not involve a solid changing directly to a gas.
4. **Sublimation**: This is the process where a solid changes directly to a gas without passing through the liquid state.

Therefore, the correct answer is **Sublimation**.

Which of the following is the process by which a solid changes directly to a gas without first becoming a liquid?MeltingBoilingEvaporationSublimation

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